Add a bit more to the README

README.md

@@ -2,6 +2,40 @@
 
 A command line tool in Haskell to identify unused code.
 
+## Using Unused
+
+`unused` reads from a pipe expecting a series of tokens to search the codebase
+for.
+
+This could be done with `echo`:
+
+```sh
+echo "module\nimport" | unused
+```
+
+Or pulling in a ctags file:
+
+```sh
+cat .git/tags | cut -f1 | sort -u | unused
+```
+
+My end goal is to have the latter rolled up into unused itself, so you can
+navigate to a directory, run `unused`, and everything works as expected.
+
+## Building and Compiling
+
+This project uses Haskell and Stack.
+
+Once you have these tools installed:
+
+```sh
+stack setup
+stack build
+```
+
+This will generate a binary in `.stack-work/install/**/**/**/bin` that you'll
+want to move to somewhere in your `$PATH`.
+
 ## License
 
 Copyright 2016 Josh Clayton. See the [LICENSE](LICENSE).