Create CONTRIBUTING.md

Author: ParticleCore

CONTRIBUTING.md

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+If you do not follow the following instructions your issue will be immediately closed and tagged as `invalid`.
+
+Before reporting a new issue please first follow the troubleshooting guide:
+https://github.com/ParticleCore/Particle/wiki/Report-a-problem#troubleshooting  
+
+It contains steps that will help you solve most of the problems that might not be related or directly related to the extension.
+
+Make sure that your issue doesn't already exist, use the search box for this purpose.
+
+Remember to search in the closed issues section:
+https://github.com/ParticleCore/Particle/issues?q=is%3Aissue+is%3Aclosed
+
+Issues must be in English only, no other language will be accepted.
+
+To increase the chances of replicating your issue please fill in the template with the necessary information:
+https://github.com/ParticleCore/Particle/wiki/Report-a-problem#posting-a-new-issue