Create README.md

Create the README.md file and added description and info about supported/unsupported OSes.

README.md

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+# SpacEscape2D
+#### Created by Abheek Dhawan
+SpacEscape2D is a simple 2D game centered around controlling a rocket while avoiding asteroids. It was created in `Godot` and is the newer version of a 3D game I made in `Unity`
+
+#### Current and planned supported operating systems:
+- [x] HTML
+- [x] Linux
+- [x] macOS
+- [X] Windows
+- [ ] Android
+- [ ] iOS
+- [ ] Raspberry Pi (deb)