Create CONTRIBUTING.md

Author: satwikkansal

CONTRIBUTING.md

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+## How to contribute to the project?
+
+All kind of contributions are welcome. If the change you are suggesting is significant, please do create an issue before working on the patch.
+
+## Things to keep in mind
+
+- The project is designed to be beginner friendly. There are some conscious trade-offs that I've made to keep it simple (as compared to a real-world blockchain project like Bitcoin which will involve a lot of intricacies).
+- The coding style is analogous to PEP-8. It's not strictly followed, but please do keep existing style in mind while writing code and as many comments as possible (so that it's easier for others to understand).
+
+Lastly, thanks for considering to contribute to the project.