Created CONTRIBUTING.md file and docs folder.

Author: jzshred

docs/CONTRIBUTING.md

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+# Contributing to this repo
+:+1::tada: Thanks a lot for considering taking some time to contribute to this repo, I really appreciate it! :tada::+1:
+
+The guidelines described in this file should be followed most of the times, but these are not hard rules. This is a small project after all, so feel free to propose changes and enhancements in a pull request.
+
+## Code of conduct
+No matter how good of a programmer you are, if you are a bad person, we don't want you in this repo. __Be nice__ with others, we are all learning all the time so try to always respect others, answer with helpful advice or insightful tips and get along.
+
+## How can I contribute?
+
+### Adding new questions and answers
+
+Choose a Python subject and add questions and answers that are not already covered, or add an entirely new subject.
+
+### Adding new features
+
+Add new features that you consider would be useful to the user. This repo follows TDD, so if you would like to add a new feature to the code, please add a corresponding test for it.
+
+### Reporting bugs
+
+Let us know if you find any bugs in the code. To submit a good bug report, create an issue in the repository and follow the guidelines established in the ISSUE_TEMPLATE.md file.