Meta: Add pr and issue templates

[ruben-iteng]

🈸 The PR template looks like this:

Description

Add issue and pr templates using github forms (beta) using the info from here.
Added 2 placeholder files to prevent dead links:

• docs/CODE_OF_CONDUCT.md
• docs/CONTRIBUTING.md

Github specific files are placed in /.github/
Generic files are placed in /docs/

PR type

New feature (non-breaking change which adds functionality)

Linked Issue

closes #18

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works (if applicable)
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

Code of Conduct

By submitting this issue, you agree to follow our Code of Conduct

• I agree to follow this project's Code of Conduct