### Motivation
While this isn't technically necessary, as all versions of a platform
not explicitly mentioned are assumed to be supported, it's better to be
explicit here.
### Modifications
Add `visionOS(.v1)` to the list of supported platforms.
### Result
Clearer support matrix.
### Test Plan
N/A, this is basically just a documentation change.
### Motivation
Surface the Swift version and platform support status from Swift Package
Index.
### Modifications
Added badges, plus a quick link to the docc docs, to the top of the
README.
Also, expanded the supported platforms, we do actually support iOS and
friends (was an oversight not to include it before).
### Result
Easier to quickly see our support matrix, plus the quick link to docs.
### Test Plan
Previewed locally.
### Motivation
Relax deployment target to macOS 10.15
### Modifications
- Reduced requirement from macOS 13 to macOS 10.15
- Added the minimum version to readme and documentation
### Result
- Users will be able to deploy it on projects with a minimum deployment
target of 10.15