Add CONTRIBUTING.md explaining how to contribute to this project

CONTRIBUTING.md

@@ -0,0 +1,34 @@
+# Contributing To Arduino Makefile
+
+Community made patches, localisations, bug reports, documentation and contributions are always welcome and are crucial to the success of this project.
+
+When contributing please ensure you follow the guidelines below so that we can keep on top of things.
+
+## Getting Started
+
+Submit a ticket for your issue, assuming one does not already exist.
+
+- Raise it on our [Issue Tracker](https://github.com/sudar/Arduino-Makefile/issues)
+- Clearly describe the issue including steps to reproduce the bug.
+- Make sure you fill in the earliest version that you know has the issue as well as the following
+    - Your operating system (Mac, Linux/Unix, Windows)
+    - Your Arduino IDE version
+    - Snippet of your makefile
+
+## Making Changes
+
+- Fork the repository on GitHub
+- Make the changes to your forked repository
+- Update the [changelog file](HISTORY.md) and add a note about your change. If possible prefix it with either Fix, Tweak or New
+- When committing, reference your issue (if present) and include a note about the fix
+    - If possible (and if makes sense) do atomic commits
+    - Try to follow [this guideline](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html) while choosing the git commit message
+- Push the changes to your fork and submit a pull request to the 'master' branch of the this repository
+
+At this point you're waiting on us to merge your pull request. We'll review all pull requests, and make suggestions and changes if necessary.
+
+# Additional Resources
+
+- [General GitHub Documentation](http://help.github.com/)
+- [GitHub Pull Request documentation](http://help.github.com/send-pull-requests/)
+- [Guide about contributing code in GitHub](http://sudarmuthu.com/blog/contributing-to-project-hosted-in-github)

HISTORY.md

@@ -17,6 +17,7 @@ I tried to give credit whenever possible. If I have missed anyone, kindly add it
 - New: Add option to set fuses without burning a bootloader. Fix #141 (https://github.com/sej7278)
 - Tweak: Don't append port details to avrdude for usbtiny. Fix #140 and #138 (https://github.com/PPvG)
 - Fix: Handle relative paths of bootloader file while burning bootloaders. Fix #126 and #142 (https://github.com/sej7278)
+- New: Add `CONTRIBUTING.md` explaining how to contribute to the project.
 
 ### 1.0.1 (2013-09-25)
 - Unconditionally add -D in avrdude options. See #114