Readd Checklist and fix typo in pr template

[CodingAdam]

Describe your changes

Readded the checklist, looks it got accidentally removed at some-point.

Issue number and link

N/A

Screenshots (if appropriate):

Types of changes

• Bug fix (fixes a issue)
• New feature (new implementation of a feature)
• Refactoring (small changes that won't impact very much)
• Possible broken change (fix or feature that could break functionality)

Checklist:

• Have added comments and documentation
• You have tested all the code thoroughly
• I have added tests to cover my changes.
  Or have added an issue that tests need to be added.
• If scene changes were made were they in a separate scene (Doesn't apply to CodingAdam)

[GNAR1ZARD]

Good job adding that mandatory file and updating the template. Approving

[Grimmblood]

approving for finalizing DP3