Update package version to 0.3.1 and add license information (#120) (#120)

- Bumped the version of the @playcanvas/react package from 0.3.0 to 0.3.1 in both package.json and package-lock.json.
- Added license information as "MIT" to ensure compliance and clarity across the project.

Author: marklundin

package-lock.json

@@ -2,7 +2,7 @@
     "name": "@playcanvas/react",
     "description": "A React renderer for PlayCanvas – build interactive 3D applications using React's declarative paradigm.",
     "homepage": "https://playcanvas-react.vercel.app",
-    "version": "0.3.0",
+    "version": "0.3.1",
     "license": "MIT",
     "type": "module",
     "sideEffects": false,