Create CONTRIBUTING.md

Author: stleary

CONTRIBUTING.md

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+# Contribution Guidelines
+
+Feel free to work on any issue with a #hacktoberfest label.
+
+If you discover an issue you would like to work on, you can add a new issue to the list. If it meets our criteria, a hacktoberfest label will be added.
+
+# Who is allowed to submit pull requests for this project?
+
+Anyone can submit pull requests for code, tests, or documentation.
+
+# How do you decide which pull requests to accept?
+
+* Does it call out a bug that needs to be fixed? If so, it goes to the top of the list.
+* Does it fix a major user inconvenience? These are given high priority as well.
+* Does it align with the specs? If not, it will probably not be accepted. It turns out there are gray areas in the specs. If this is in a gray area, it will likely be given the benefit of the doubt.
+* Does it break the existing behavior of the lib? If so, it will not be accepted, unless it fixes an egregious bug. This is happening less frequently now.
+
+# For more guidance, see these links:
+
+[README.md (includes build instructions)](https://github.com/stleary/JSON-java#readme)
+
+[FAQ - all your questions answered](https://github.com/stleary/JSON-java/wiki/FAQ)