Fixed #586: Added an extensions docs section

indigo/docs/01-quickstart/extensions-and-libs.md

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+# Extensions, Libraries, and Related Projects
+
+## Extensions
+
+Extensions to Indigo, built ontop of the API's Indigo provides.
+
+### Roguelike-Starterkit
+
+A toolkit that acts as a terminal emulator, allowing you to render ASCII art in Indigo.
+
+[https://github.com/PurpleKingdomGames/roguelike-starterkit](https://github.com/PurpleKingdomGames/roguelike-starterkit)
+
+## Libraries
+
+Libraries designed to support Indigo.
+
+### Ultraviolet
+
+A Scala 3 to GLSL transpiler. All of Indigo's code shaders are build with Ultraviolet.
+
+[https://github.com/PurpleKingdomGames/ultraviolet](https://github.com/PurpleKingdomGames/ultraviolet)
+
+## Related Projects
+
+Other projects that work with Indigo.
+
+### Tyrian + Tyrian Bridge
+
+An Elm-like frontend development library for Scala.js. Tyrian has an Indigo 'bridge' library that allows you to include Indigo games directly into your SPA and communicate with it in a typesafe way, all int he same code base.
+
+[https://github.com/PurpleKingdomGames/tyrian](https://github.com/PurpleKingdomGames/tyrian)