Update README.md

Author: Smidgens

README.md

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-Todo: about
+![](/.github/banner.png?raw=true "")
+
+# ℹ️ Features
+
+* Various utility extensions for working with common System and Unity types.
+
+<br/>
+
+
+**⌛ Planned**
+
+* [ ] Editor extensions (assets, gui etc.)
+* [ ] Preprocessor symbols to disable extensions on a per-type basis (ie. `EXTENSIONS_DISABLE_UNITYENGINE_RECT`.
+* [ ] Online documentation
+
+<br/>
+
+# 📦 Install
+
+1. Open Package Manager
+2. Paste GitHub URL:\
+`https://github.com/Smidgens/unity-extensions.git#<version_tag>`
+
+
+<br/>
+
+# 🚀 Use
+
+See `Runtime` folder for full list of extensions.
+
+