Add PR and ISSUE GitHub templates

[jmlavoier]

PR Details

• Add a github PR template
• Add a ISSUE template

Description

It's a template that's going to guide contribuitors to create a clean and well explained pull requests and issues

Related Issue

https://github.com/danguilherme/spotivy/issues/16

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist

Go over all the following points, and put an x in all the boxes that apply. If you're unsure about any of these, don't hesitate to ask. We're here to help!

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.