Add project info and build instructions

README.md

@@ -1 +1,36 @@
 # BetaFix
+BetaFix lets you enjoy Minecraft Beta 1.7.3 with working authentication, skins
+and capes! BetaFix does not rely on a third party proxy, everything is fixed
+client-side.
+
+The bigest drawback of methods that rely on third party proxies is that you as
+a user do not have control over the proxy. With BetaFix you can verify and
+build the mod yourself!
+
+## Ingame screenshot
+![Ingame screenshot with working skin and cape.](https://sweetcraft.net/files/github-assets/betafix/ingame-screenshot.png)
+
+## Build instructions
+To build the mod from scratch, simply run:
+```shell
+./build.sh
+```
+
+## Installation instructions
+BetaFix can easily be installed in [MultiMC](https://multimc.org/#Download).
+
+Assuming you have created a clean Minecraft Beta 1.7.3 instance and build the
+mod yourself or grabbed the ZIP-file from the latest release, follow these
+instructions:
+1. On the right-hand-side, click on `Edit Instance`.
+2. On the right-hand-side, click on `Add to Minecraft.jar`.
+3. Navigate to the `BetaFix.zip` file and open it.
+4. BetaFix is now installed as a JAR-mod, the `Version` tab should look like
+this:
+
+![MultiMC Version tab with BetaFix installed.](https://sweetcraft.net/files/github-assets/betafix/multimc-screenshot.png)
+
+## Acknowledgements
+The creation of this fix was made very easy thanks to the
+[RetroMCP-Java](https://github.com/MCPHackers/RetroMCP-Java) tool and
+[wiki.vg](https://wiki.vg/Main_Page)!