doc: update readme

README.md

@@ -11,3 +11,35 @@ Please note that there is no explicit documentation available. The code is chang
  - VRChat Creator Companion
 	- VRC World SDK
  - [CyanPlayerObjectPool](https://cyanlaser.github.io/CyanPlayerObjectPool/)
+
+
+## Versioning
+
+This package is versioned using [Semantic Version](https://semver.org/).
+
+The used pattern MAJOR.MINOR.PATCH indicates: 
+
+1. MAJOR version: incompatible API changes occurred
+   - Implication: after updating backup, check and update your scenes/scripts as needed
+2. MINOR version: new functionality has been added in a backward compatible manner
+   - Implication: after updating check and update your usages if needed
+3. PATCH version: backward compatible bug fixes were implemented
+   - Implication: after updating remove potential workarounds you added
+
+## 2.0.0 Change Notes
+
+### Additions
+* Add `ImageDownloader`
+* Add `GetMaster` from list of players helper function to `VRCPlayerUtils`
+* Add optional position smoothing to `PlayerFollower`
+* Add timestamp backlog of received Deserializations and `PredictionReduction` parameter to `TlpAccurateSyncBehaviour`
+* Add UI prefabs for runtime test system
+* Add demo scene for new runtime test system
+### Fixes
+- Improve error handling on `PackageExporter`
+- Fix `TrackingDataFollower` crashing if local player is not yet valid
+### Deletions
+- Remove `FormerlySerializedAs` entries from `TlpLogger`
+### Other
+- Rename `useLocalPlayerByDefault` to  `UseLocalPlayerByDefault` in `ObjectSpawner`
+- Complete overhaul of runtime test system