Add contributing guidelines

CONTRIBUTING.md

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+For those who are wanting to contribute, we fully encourage doing so. There are a few rules we require following when contributing however.
+
+## Steps
+1. Make an issue and get feedback. It's important to know if your idea will be accepted before writing any code.
+- If it is a feature request, describe the feature and be extremely specific.
+- If it is a bug report, ensure you include how to reproduce the bug and the expected outcome
+- If it is an enhancement, describe your proposed changes. Ensure you are extremely specific.
+2. Fork this project
+3. Create a new branch that describes the new feature, enhancement, or bug fix. For example, this is good: `feature/add-xyz`. This is bad: `fix-this-lol`.
+4. Write the code that addresses your change.
+- Keep in mind that it **must** be formatted correctly. If you are using IntelliJ, there is a `codeStyle.xml` file that tells IntelliJ how to format your code. Check this link for information on how to use the file: https://www.jetbrains.com/help/idea/configuring-code-style.html#import-export-schemes
+- If you are not using IntelliJ, that is fine. We use Allman style so please format your code accordingly.
+6. Push your changes to your new branch and make a PR based off of that branch.
+
+## Requirements for a PR
+- The issue must be marked as approved
+- It must only address each specific issue. Don't make one PR for multiple issues.
+- Your PR must compile and work. If it does not compile or work, your PR will most likely be rejected.
+
+## Code requirements
+- Most importantly, your code must be efficient. Your pull request may be rejected if your code is deemed inefficient or sloppy.
+- Do not repeat yourself. Create functions as needed if you're using large blocks of code over and over again.
+- Do not use an excessive amount of commits when making your PR. It makes the master branch look messy.
+- Your code must be consistent with Plex's codebase. If a function already exists, use it.