Add initial CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to BOINC
+:+1: First off, thank you for taking the time to contribute! It's people like you that make BOINC such a great tool. :+1:
+
+## How Can I Contribute?
+
+### Helping translate
+See: https://boinc.berkeley.edu/trac/wiki/TranslateIntro
+
+### Reporting Bugs
+Did you find a bug? Make a Bug report.
+* Ensure the bug was not already reported by searching on GitHub under [Issues](https://github.com/BOINC/boinc/issues).
+* If you're unable to find an open issue addressing the problem, [open a new one](https://github.com/BOINC/boinc/issues/new).
+
+### Suggesting Enhancements
+Do you have a feture idea? Make a Feature request.
+* Ensure the feature was not already requested by searching on GitHub under [Issues](https://github.com/BOINC/boinc/issues).
+* If you're unable to find an open issue addressing the idea, [open a new one](https://github.com/BOINC/boinc/issues/new).
+
+### Making Pull Requests
+**1. Fork & create a branch**
+
+[Fork BOINC](https://help.github.com/articles/fork-a-repo/) and create a branch with a descriptive name.
+A good branch name would be:
+```
+git checkout -b update-code-of-conduct
+```
+
+**2. Implement your fix or feature**
+
+At this point, you're ready to make your changes! Feel free to ask for help, everyone is a beginner at first. :wink:
+
+Development Practices:
+* Code has followed the [style guide for BOINC](http://boinc.berkeley.edu/trac/wiki/CodingStyle)
+* Commit does not contain unrelated code changes
+* Code uses [atomic commits](https://www.freshconsulting.com/atomic-commits/)
+
+**3. Sync changes made in the original repository with your fork**
+At this point, you should switch back to your master branch and [make sure it's up to date with BOINC's master branch](https://help.github.com/articles/configuring-a-remote-for-a-fork/):
+
+```
+git remote add upstream https://github.com/BOINC/boinc.git
+git checkout master
+git pull upstream master
+```
+
+Then update your branch from your local copy of master, and push it!
+
+```
+git checkout update-code-of-conduct
+git rebase master
+git push --set-upstream origin update-code-of-conduct
+```
+
+**4. Make a Pull Request** 
+
+Finally, go to GitHub and [make a Pull Request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/).
+
+## Styleguides
+
+### Git Commit Messages
+* Use the present tense ("Add feature" not "Added feature")
+* Use the imperative mood ("Move cursor to..." not "Moves cursor to...")
+
+
+Thanks! :heart:
+
+BOINC Team