Update README.md

README.md

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 # xboxlive-auth
-A program to retrieve a Minecraft account's access token based on the new Microsoft authentication scheme.
+A proof-of-concept program to retrieve a Minecraft account's access token based on the new Microsoft authentication scheme.
+
+## Command line arguments
+
+Run `xboxlive-auth --help` or `./xboxlive-auth --help`.
+
+## Compiling from source
+
+1. Download the `rustup` toolchain right [here](https://rustup.rs/). Follow the instructions for your platform.
+2. Run `git clone https://github.com/chronicallyunfunny/xboxlive-auth.git` in an appropriate directory to clone the repo.
+3. In the folder named `xboxlive-auth`, run `cargo build --release`. The resulting executable file after compilation should be in the `target/release/` directory relative from the `xboxlive-auth` folder.