update readme

readme.md

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+# Knife
+
+A collection of useful micro-modules for Lua.
+
+ * [knife.base](readme/system.md) - A base class for class-based OOP.
+ * [knife.event](readme/event.md) - Dispatch and handle events.
+ * [knife.memoize](readme/memoize.md) - A memoization function.
+ * [knife.system](readme/system.md) - An entity component system.
+ * [knife.test](readme/test.md) - A fixture-free test framework.
+
+
+Each module is self-contained, with no dependencies.
+
 [![Build Status](https://travis-ci.org/airstruck/knife.svg)](https://travis-ci.org/airstruck/knife) [![Coverage Status](https://coveralls.io/repos/airstruck/knife/badge.svg)](https://coveralls.io/r/airstruck/knife)
+