Create README.md

Author: sator-imaging

README.md

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+# Unity Scripting Fundamentals
+
+## Features
+
+- Rutime
+    - [Nullable support for `UnityEngine.Object`](https://sator-imaging.github.io/Unity-Fundamentals/HeaderDocs/Runtime/NullableUnityObject.cs.html)
+    - WIP: [CancellationToken based Lifecycle Manager for Unity](https://sator-imaging.github.io/Unity-Fundamentals/Runtime/LifecycleBehaviour/README.html)
+- Editor
+    - [Assembly Definitions Manager for Project Settings Panel](https://sator-imaging.github.io/Unity-Fundamentals/HeaderDocs/Editor/AssemblyDefinitionSettingsProvider/AssemblyDefinitionSettingsProvider.cs.html)
+
+## API Reference
+
+https://sator-imaging.github.io/Unity-Fundamentals/api/index.html