Create README.md with API and contribution details

Added initial documentation for the BuniMart API, including contribution guidelines.

Author: ilikecereal1

README.md

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+# BuniMart API
+This is the BuniMart API that should be used to route requests for products, categories, and images (TBA), published on a seperate repository to not publish the whole source code. 
+
+## Contributions
+### If you do not know how to use GitHub or write products in JSON:
+[Create a new issue](https://github.com/ilikecereal1/BuniMart-API/issues/new/choose) and fill in the appropriate template.
+### If you know what you're doing:
+Fork this repository, add your changes and make a pull request.
+#### Note for people who want to directly contribute:
+Do not force push this repository unless you know what you are doing, please use pull requests.