Create contributing.md

Author: alex-semenyuk

contributing.md

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+# Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Suggested Github Wiki should be useful and stand out in some way.
+- Make an individual pull request for each suggestion.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+
+Thank you for your suggestions!