chore: add setDevKey and upsertDocument methods

docs/examples/java/databases/create-documents.md

@@ -0,0 +1,24 @@
+import io.appwrite.Client;
+import io.appwrite.coroutines.CoroutineCallback;
+import io.appwrite.services.Databases;
+
+Client client = new Client(context)
+    .setEndpoint("https://<REGION>.cloud.appwrite.io/v1") // Your API Endpoint
+    .setKey(""); // 
+
+Databases databases = new Databases(client);
+
+databases.createDocuments(
+    "<DATABASE_ID>", // databaseId 
+    "<COLLECTION_ID>", // collectionId 
+    listOf(), // documents 
+    new CoroutineCallback<>((result, error) -> {
+        if (error != null) {
+            error.printStackTrace();
+            return;
+        }
+
+        Log.d("Appwrite", result.toString());
+    })
+);
+