Add DocC symbol reference file for RedisCommand

Sources/RediStack/Documentation.docc/RedisCommand.md

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+# ``RediStack/RedisCommand``
+
+@Metadata {
+    @DocumentationExtension(mergeBehavior: append)
+}
+
+## Command Definitions
+
+Commands that are directly supported by **RediStack** will use the same spelling and naming as found in Redis,
+and are defined as static functions.
+
+For the full list of Redis commands, reference the [Redis Command documentation](https://redis.io/commands).
+
+Some commands are available directly as extensions on ``RedisClient``.
+
+## Custom Commands
+
+If a command is not directly supported by **RediStack**, you can write your own extension on ``RedisCommand`` and use
+the various initializers.
+
+While the `ResultType` of the command is a concrete Swift type, such as an enum, it needs to first be parsed from
+the raw ``RESPValue`` Redis response, which is done with the `mapValueToResult` closure of ``init(keyword:arguments:mapValueToResult:)``.
+
+For types conforming to ``RESPValueConvertible``, this done automatically with the `init(keyword:arguments)` initializer.
+
+## Topics
+
+### Command components
+
+- ``keyword``
+- ``arguments``
+
+### Creating a custom command
+
+- ``init(keyword:arguments:mapValueToResult:)``
+
+### Connection Commands
+
+- ``echo(_:)``
+- ``ping(with:)``
+- ``auth(with:)``
+- ``select(database:)``
+
+### Hash Commands
+
+- ``hdel(_:from:)-4s5f6``
+- ``hdel(_:from:)-8zyjq``
+- ``hexists(_:in:)``
+- ``hget(_:from:)``
+- ``hgetall(from:)``
+- ``hincrby(_:field:in:)``
+- ``hincrbyfloat(_:field:in:)``
+- ``hkeys(in:)``
+- ``hlen(of:)``
+- ``hmget(_:from:)-az2q``
+- ``hmget(_:from:)-52q0x``
+- ``hset(_:to:in:)``
+- ``hmset(_:in:)``
+- ``hsetnx(_:to:in:)``
+- ``hstrlen(of:in:)``
+- ``hvals(in:)``
+- ``hscan(_:startingFrom:matching:count:)``
+
+### Key Commands
+
+- ``del(_:)``
+- ``exists(_:)-5g9rq``
+- ``exists(_:)-9qli9``
+- ``expire(_:after:)``
+- ``ttl(_:)``
+- ``pttl(_:)``
+- ``keys(matching:)``
+- ``scan(startingFrom:matching:count:)``
+
+### List Commands
+
+- ``blpop(from:timeout:)-64l4w``
+- ``blpop(from:timeout:)-5y458``
+- ``blpop(from:timeout:)-881zh``
+- ``brpop(from:timeout:)-3uers``
+- ``brpop(from:timeout:)-235os``
+- ``brpop(from:timeout:)-906qk``
+- ``brpoplpush(from:to:timeout:)``
+- ``lindex(_:from:)``
+- ``linsert(_:into:before:)``
+- ``linsert(_:into:after:)``
+- ``llen(of:)``
+- ``lpop(from:)``
+- ``lpush(_:into:)-9wnpn``
+- ``lpush(_:into:)-6vdyu``
+- ``lpushx(_:into:)``
+- ``lrange(from:firstIndex:lastIndex:)``
+- ``lrange(from:indices:)-947k1``
+- ``lrange(from:indices:)-555up``
+- ``lrange(from:fromIndex:)``
+- ``lrange(from:upToIndex:)``
+- ``lrange(from:throughIndex:)``
+- ``lrem(_:from:count:)``
+- ``lset(index:to:in:)``
+- ``ltrim(_:before:after:)``
+- ``ltrim(_:keepingIndices:)-594fr``
+- ``ltrim(_:keepingIndices:)-9k7s6``
+- ``ltrim(_:keepingIndices:)-9gvv8``
+- ``ltrim(_:keepingIndices:)-243g``
+- ``ltrim(_:keepingIndices:)-3q1zz``
+- ``rpop(from:)``
+- ``rpoplpush(from:to:)``
+- ``rpush(_:into:)-9k27q``
+- ``rpush(_:into:)-97xay``
+- ``rpushx(_:into:)``
+
+### Pub/Sub Commands
+
+- ``publish(_:to:)``
+- ``pubsubChannels(matching:)``
+- ``pubsubNumpat()``
+- ``pubsubNumsub(forChannels:)``
+
+### Server Commands
+
+- ``swapdb(_:with:)``
+
+### Set Commands
+
+- ``sadd(_:to:)-2hh4m``
+- ``sadd(_:to:)-4sxtr``
+- ``scard(of:)``
+- ``sdiff(of:)-67ekq``
+- ``sdiff(of:)-3f66d``
+- ``sdiffstore(as:sources:)``
+- ``sinter(of:)-7pqph``
+- ``sinter(of:)-90a5u``
+- ``sinterstore(as:sources:)``
+- ``sismember(_:of:)``
+- ``smembers(of:)``
+- ``smove(_:from:to:)``
+- ``spop(from:max:)``
+- ``srandmember(from:max:)``
+- ``srem(_:from:)-2n6ud``
+- ``srem(_:from:)-21xah``
+- ``sunion(of:)-2gx4``
+- ``sunion(of:)-3baqs``
+- ``sunionstore(as:sources:)``
+- ``sscan(_:startingFrom:matching:count:)``
+
+### SortedSet Commands
+
+- ``bzpopmin(from:timeout:)-7ht1z``
+- ``bzpopmin(from:timeout:)-5lf0y``
+- ``bzpopmin(from:timeout:)-97ikd``
+- ``bzpopmax(from:timeout:)-9f01n``
+- ``bzpopmax(from:timeout:)-6c5lj``
+- ``bzpopmax(from:timeout:)-79p3g``
+- ``zadd(_:to:inserting:returning:)-4yuz4``
+- ``zadd(_:to:inserting:returning:)-1evtg``
+- ``zadd(_:to:inserting:returning:)-1drwk``
+- ``zcount(of:withScoresBetween:)``
+- ``zcount(of:withMaximumScoreOf:)``
+- ``zcount(of:withMinimumScoreOf:)``
+- ``zcount(of:withScores:)-6b7ne``
+- ``zcount(of:withScores:)-6bujq``
+- ``zcard(of:)``
+- ``zincrby(_:in:by:)``
+- ``zinterstore(as:sources:weights:aggregateMethod:)``
+- ``zlexcount(of:withValuesBetween:)``
+- ``zlexcount(of:withMinimumValueOf:)``
+- ``zlexcount(of:withMaximumValueOf:)``
+- ``zpopmax(from:)``
+- ``zpopmax(from:max:)``
+- ``zpopmin(from:)``
+- ``zpopmin(from:max:)``
+- ``zrange(from:firstIndex:lastIndex:returning:)``
+- ``zrange(from:indices:returning:)-95y9o``
+- ``zrange(from:indices:returning:)-4pd8n``
+- ``zrange(from:fromIndex:returning:)``
+- ``zrange(from:throughIndex:returning:)``
+- ``zrange(from:upToIndex:returning:)``
+- ``zrangebylex(from:withValuesBetween:limitBy:)``
+- ``zrangebylex(from:withMaximumValueOf:limitBy:)``
+- ``zrangebylex(from:withMinimumValueOf:limitBy:)``
+- ``zrevrangebylex(from:withValuesBetween:limitBy:)``
+- ``zrevrangebylex(from:withMaximumValueOf:limitBy:)``
+- ``zrevrangebylex(from:withMinimumValueOf:limitBy:)``
+- ``zrangebyscore(from:withScoresBetween:limitBy:returning:)``
+- ``zrangebyscore(from:withScores:limitBy:returning:)-4ukbv``
+- ``zrangebyscore(from:withScores:limitBy:returning:)-phw``
+- ``zrangebyscore(from:withMaximumScoreOf:limitBy:returning:)``
+- ``zrangebyscore(from:withMinimumScoreOf:limitBy:returning:)``
+- ``zrank(of:in:)``
+- ``zrem(_:from:)-86osv``
+- ``zrem(_:from:)-1ey05``
+- ``zremrangebylex(from:withValuesBetween:)``
+- ``zremrangebylex(from:withMaximumValueOf:)``
+- ``zremrangebylex(from:withMinimumValueOf:)``
+- ``zremrangebyrank(from:firstIndex:lastIndex:)``
+- ``zremrangebyrank(from:throughIndex:)``
+- ``zremrangebyrank(from:upToIndex:)``
+- ``zremrangebyrank(from:fromIndex:)``
+- ``zremrangebyrank(from:indices:)-2mwa6``
+- ``zremrangebyrank(from:indices:)-9svqd``
+- ``zremrangebyscore(from:withScoresBetween:)``
+- ``zremrangebyscore(from:withScores:)-4lm7a``
+- ``zremrangebyscore(from:withScores:)-1t3ww``
+- ``zremrangebyscore(from:withMaximumScoreOf:)``
+- ``zremrangebyscore(from:withMinimumScoreOf:)``
+- ``zrevrange(from:firstIndex:lastIndex:returning:)``
+- ``zrevrange(from:fromIndex:returning:)``
+- ``zrevrange(from:upToIndex:returning:)``
+- ``zrevrange(from:throughIndex:returning:)``
+- ``zrevrange(from:indices:returning:)-3ikhd``
+- ``zrevrange(from:indices:returning:)-3t0hk``
+- ``zrevrangebyscore(from:withScoresBetween:limitBy:returning:)``
+- ``zrevrangebyscore(from:withScores:limitBy:returning:)-2vp67``
+- ``zrevrangebyscore(from:withScores:limitBy:returning:)-3jdpl``
+- ``zrevrangebyscore(from:withMaximumScoreOf:limitBy:returning:)``
+- ``zrevrangebyscore(from:withMinimumScoreOf:limitBy:returning:)``
+- ``zrevrank(of:in:)``
+- ``zscore(of:in:)``
+- ``zunionstore(as:sources:weights:aggregateMethod:)``
+- ``zscan(_:startingFrom:matching:count:)``
+
+### String Commands
+
+- ``append(_:to:)``
+- ``decr(_:)``
+- ``decrby(_:by:)``
+- ``get(_:)``
+- ``incr(_:)``
+- ``incrby(_:by:)``
+- ``incrbyfloat(_:by:)``
+- ``mget(_:)-9m30p``
+- ``mget(_:)-6kz3i``
+- ``mset(_:)``
+- ``msetnx(_:)``
+- ``psetex(_:to:expirationInMilliseconds:)``
+- ``set(_:to:)``
+- ``set(_:to:onCondition:expiration:)``
+- ``setex(_:to:expirationInSeconds:)``
+- ``setnx(_:to:)``
+- ``strln(_:)``