Add README

Author: Jon Gold

README.md

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+# tachyons-js
+
+Use tachyons with your favorite CSS-in-JS composition solution.
+
+Works great with [aphrodite](https://github.com/Khan/aphrodite):
+```
+import { StyleSheet } from 'aphrodite';
+import t from 'tachyons-js';
+
+const styles = StyleSheet.create({
+  foo: {
+    ...t.ma2,
+    ...t.ma2_ns,
+    ...t.bg_black,
+    ...t.bg_silver_m,
+    ...t.bg_white__l,
+  },
+});
+```
+
+WIP, hmu if it breaks.