Added How_To_Contribute.txt

How_To_Contribute.txt

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+How to Contribute to KiCad Libraries
+========================
+
+
+1) If you don't have one, create an account on www.github.com.
+
+2) Fork the repository on which you want to work, under your account:
+    https://help.github.com/articles/fork-a-repo
+
+3) Clone your newly created fork:
+    https://help.github.com/articles/fetching-a-remote
+
+4) Do your modifications, either using a text editor or the library editor
+
+5) Commit your changes:
+    git add -A
+    git commit -m "place your commit message here"
+
+6) Push to your branch:
+    git push
+
+7) Create a pull request:
+    https://help.github.com/articles/using-pull-requests
+
+8) Wait until a librarian approves your work. Discussion and corrections might be needed.