docs: Update readme and flatrun pages

README.md

@@ -26,4 +26,8 @@ flatpak-builder --install --user [BUILD_DIR] flatpak/io.github.ryanabx.flatrun.y
 
 ![Loading screen for Flatrun](res/screenshot1.png)
 
-![Running screen for Flatrun](res/screenshot2.png)
+![Running screen for Flatrun](res/screenshot2.png)
+
+## Contributing
+
+This project is open to fixes and new features! It'd be helpful to make an issue describing what you plan to implement to avoid duplicate work!

docs/index.md

@@ -2,4 +2,28 @@
 
 Run Flatpaks without installing them!
 
-[Submit issues](https://github.com/ryanabx/flatrun/issues/new)
+## Installing
+
+> **NOTE:** The main distribution method will be from `flathub`. The review process is currently occurring at https://github.com/flathub/flathub/pull/5280.
+
+```sh
+flatpak install -y flathub io.github.ryanabx.flatrun
+```
+
+## Building
+
+**Flatpak is the only supported method of building Flatrun**. Install `flatpak-builder` and run:
+
+```sh
+flatpak-builder --install --user [BUILD_DIR] flatpak/io.github.ryanabx.flatrun.yml
+```
+
+## Issues
+
+[Submit issues](https://github.com/ryanabx/flatrun/issues/new)
+
+## Command Reference
+
+```sh
+flatpak run io.github.ryanabx.flatrun -h
+```