Clean up makefile so build lib doesnt build test

README.md

@@ -1,14 +1,17 @@
 # libsm64 - Super Mario 64 as a library
 
+The purpose of this project is to provide a clean interface to the movement and rendering
+code which was reversed from SM64 by the [SM64 decompilation project](https://github.com/n64decomp/sm64),
+so that Mario can be dropped in to existing game engines or other systems with minimal effort.
+This project produces a shared library file containing mostly code from the decompilation project,
+and loads an official SM64 ROM at runtime to get Mario's texture and animation data, so any project
+which makes use of this library must ask the user to provide a ROM for asset extraction.
+
 ## Building
 
-### Linux
+Currently only linux is supported. Window support coming soon. Requires python3 to build the library,
+and SDL2 + GLEW for the test program.
 
-1. Clone this repo and cd in to it
-2. `./configure`
-3. `make`
-4. Now do something interesting with `libsm64.so`, it's not much use on its own.
-
-### Windows
-
-TODO
+- `make lib`: Build the `dist` directory, containing the shared object and public-facing header.
+- `make test`: (Default) Builds the library `dist` directory as well as the test program.
+- `make run`: Build and run the SDL+OpenGL test program.