Add contributing.md

Author: talyssonoc

contributing.md

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+# Contributing
+
+Contributions are always welcome! When contributing to Node API boilerplate we ask you to follow our code of conduct:
+
+## Code of conduct
+
+In short: _Be nice_. Pay attention to the fact that Node API boilerplate is free software, don't be rude with the contributors or with people with questions and we'll be more than glad to help you. Destructive criticism and demanding will be ignored.
+
+## Opening issues
+
+When opening an issue be descriptive about the bug or the feature suggestion, don't simply paste the error message on the issue title or description. Also, **provide code to simulate the bug**, we need to know the exact circumstances in which the bug occurs. Again, follow our [code of conduct](#code-of-conduct).
+
+## Pull requests
+
+When opening a pull request to Node API boilerplate, follow this steps:
+
+1. Fork the project;
+2. Create a new branch for your changes;
+3. Do your changes;
+4. Open the pull request;
+5. Write a complete description about the bug or the feature the pull request is about.