Link from CONTRIBUTING to the docs

Denton-L · Denton-L · commit 12a32cd83b54 · 2016-08-29T13:28:33.000-04:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -0,0 +1,5 @@
+# Contribution Guidelines
+
+Please see our contribution guidelines in [the Solidity documentation](http://solidity.readthedocs.io/en/latest/contributing.html).
+
+Thank you for your help!
