Create CONTRIBUTING.md

Author: wcoder

CONTRIBUTING.md

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+# Contribution Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Use the following format: `[App Name](Link to source code) - Description [platforms, links to store]`
+- New categories, or improvements to the existing categorization are welcome.
+- Keep descriptions short and simple, but descriptive.
+- End all descriptions with a full stop/period.
+- Check your spelling and grammar.
+- Make sure that your suggestion is positioned as the last item category.
+- Make sure your text editor is set to remove trailing whitespace.
+
+#### Projects are ineligible if:
+- Doesn't have commit for more than two years.
+- We cannot clearly understand the objective.
+- Without clear README
+
+Your contributions are always welcome! Thank you for your suggestions! :smiley: