Add CONTRIBUTING.md documentation file

CONTRIBUTING.md

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+# Contributing
+
+New contributions are welcomed. Follow this guide if you want to make one.
+
+## Make a pull request
+
+Follow [Github guide](https://help.github.com/articles/creating-a-pull-request) to fork a repo
+and create a pull request.
+
+All bug fixes and new features should go to the [`master`](https://github.com/gemini-testing/glob-extra/tree/master) branch.
+
+## Commit messages
+
+Commit messages should describe what have been changed and why. The first line should be wrapped
+to 50 characters, the second one should be blank. All other lines should be wrapped to 72 characters.
+
+## Code style and static analysis
+
+Before submitting pull request, make sure your code passes all code style and static analysis checks.
+To do so, run:
+
+```
+npm run lint
+```
+
+## Tests
+
+Make sure all tests are passing before submitting pull request:
+
+```
+npm test
+```
+
+If you are fixing the bug, add a test that fails without your patch and passes with it. If you are
+adding a feature, write a test for it. To see test coverage report run:
+
+```
+npm run cover
+```
+
+## Issues reporting
+
+When submitting an issue please do following:
+
+1. [Search](https://github.com/gemini-testing/glob-extra/issues) for same issues on github in order to prevent duplicates
+2. Provide the most detailed issue description so we will additional info to work with
+
+Note that if no response for contributors questions will be provided in 1 week then issue may be considered as irrelevant/resolved and may be closed.