add contribution guide

CONTRIBUTING.md

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+# Contribute To CodeReviewShop's Blog
+
+Thank you for taking the time to contribute! ❤️
+
+CodeReviewShop's mission is to help students grow with a solid foundation of the concepts and tools needed to be a thriving software engineer.
+
+> **Legal Notice**
+>
+> When contributing to this project, you must agree that you have authored 100% of the content, that you have the necessary rights to the content and that the content you contribute may be provided under the project license.
+
+## Suggest Articles
+
+- To suggest an article, create an [issue](https://github.com/CodeReviewShop/blog/issues/new/choose) using the **Article Request** template.
+
+## Add New Articles
+
+- To add new articles, create an [issue](https://github.com/CodeReviewShop/blog/issues/new/choose) using the **Add New Article** template.
+
+## Other Ways To Contribute
+
+If you like the project, but just don't have time to contribute, that's fine. There are other easy ways to support the project and show your appreciation, which we would also be very happy about:
+
+- Star the project.
+- Tweet about it.
+- Refer this project in your project's README.
+- Mention the project at local meetups and tell your friends/colleagues.