Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Issues, Bug Reports, and Feature Requests
+
+* When creating a new Issue, first search to see if it has already been filed.
+* Bug reports must include the following or will be deleted:
+    * Steps to reproduce.
+    * Expected result.
+    * Actual result.
+    * A Short, Self Contained, Correct, Example: http://sscce.org/
+    * Notes, log files, screen captures, videos, etc. to show the problem.
+
+# Code Contributions and Pull Requests
+
+Before starting work on a pull request, please read: https://github.com/openpnp/openpnp/wiki/Developers-Guide#contributing
+
+Summary of guidelines:
+
+* One pull request per issue, bug or feature.
+* Describe the change in detail and why it is needed.
+* Follow the coding style.
+* Include tests and documentation.
+* Run and pass the tests.
+* Think of how this affects other users.