docs: Update README

README.md

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-# template
-template for brand new github repositories
+# Uno Platform - .NET Runtime fork
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+This repository is the home of the [dotnet/runtime](https://github.com/dotnet/runtime) fork for the [Uno Platform](https://github.com/unoplatform/uno).
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+It contains adjustments over the official runtime for the Uno Platform in order to enable or disable specific features for the WebAssembly runtime (e.g. enabling AOT, IDBFS, etc...).
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+It is packaged to be used along with the [Uno.Wasm.Bootstrap](https://github.com/unoplatform/uno.wasm.bootstrap) nuget package.