docs: 📝 Update readme with download, dev, and controls info

README.md

@@ -17,6 +17,28 @@ Experimenting with Godot 4's new volumetrics system.
 ![Light rays](https://media.discordapp.net/attachments/902166543356542996/995246835880972338/unknown.png)
 </details>
 
+## Download
+
+[![github](https://cdn.jsdelivr.net/npm/@intergrav/devins-badges@3/assets/cozy/available/github_vector.svg)](https://github.com/Steveplays28/godot-volumetrics-test/releases/latest)
+
+Exported to Windows, Linux (x86_64), and MacOS.
+
+## Controls
+
+- `Mouse`: look around
+- `WASD`: movement
+- `Shift`: run
+- `F11`: toggle fullscreen
+
+Mouse cursor gets hidden when the window is in focus.
+
+## Development
+
+Godot version: `4.0 stable`
+
+If you wish to make changes, please [fork](https://github.com/Steveplays28/godot-volumetrics-test/fork) the repository and make a [pull request](https://github.com/Steveplays28/godot-volumetrics-test/compare).  
+Feel free to open an issue as well.
+
 ## Attribution
 
 - [*27 Vegetation 3d Assets* by L4M0S](https://l4m0s.itch.io/27-vegetation-3d-assets)