Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution Guidelines
+
+## Adding to this list
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search existing articles before adding a new one, as yours may be a duplicate.
+- Make sure the article is useful before submitting.
+- Use the following format: `- [] [title](link)`
+- Link additions should be added to the bottom of the relevant category.
+- New categories or improvements to the existing categorization are welcome.
+- Check your spelling and grammar.
+
+Thank you for your contributions!