Update README.md

Author: celojevic

README.md

@@ -1,2 +1,15 @@
 # NetworkTilemap
- Networked tilemap synchronizer for FishNet.
+Networked tilemap synchronizer for FishNet.
+ 
+# Unity version (IMPORTANT!)
+2022.1 or newer
+- Unity has made the Tilemap.tilemapTileChanged event available during runtime from this version forward.
+ 
+# Setup
+- Create a Tilemap like usual
+-- (Optional) Attach a NetworkGrid to the parent Grid object
+- Attach the NetworkTilemap component to the newly created Tilemap object
+- Add tiles to its tiles list which you want to be synced over the network.
+
+# Usage
+Make any edits directly to the Tilemap component on the *SERVER* side. The server will catch the change events, update the serializable tile data in a SyncDictionary, and the SyncDictionary callback update it on clients.