Update README to be more useful.

asottile · asottile · commit 6bb0b121d6c8 · 2014-03-16T19:56:15.000-07:00
diff --git a/README.md b/README.md
@@ -4,3 +4,12 @@ pre-commit
 A framework for managing and maintaining multi-language pre-commit hooks.
 
 Some out-of-the-box hooks: https://github.com/pre-commit/pre-commit-hooks
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+
+## What is a "pre-commit"
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+A pre-commit is some code that runs before commiting code to do some spot-checking for some basic programming mistakes.
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+## Why make this project?
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+We noticed that when creating a git repo it was not convenient to create pre-commit hooks.  Often we resorted to copy/paste to include a set of useful hooks. https://github.com/causes/overcommit is an awesome project, but locked us into ruby and system packages -- which we wanted to avoid.
