added contributing.md

dg · dg · commit 005799dca8b9 · 2014-09-05T01:59:05.000+02:00
diff --git a/contributing.md b/contributing.md
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+How to contribute
+=================
+
+Nette welcomes contributions. If you'd like to contribute,
+please [read the guidelines](http://nette.org/en/contributing).
+Thanks for your contribution!
