Release changelog automation

[Arif-Khalid]

Summary:

Fixes #273

Type of change:

• ✨ New Feature/ Enhancement

Changes Made:

• Add release-drafter yml file for release drafter bot to work on WATcher
• Refer to release-drafter bot
• Testing locally on fork successfully creates accurate drafts same as what is currently working on CATcher

Proposed Commit Message:

Changelogs are not properly formatted by release-drafter when making new releases

This is prone to human error and wastes developer resources

Let's follow the example of CATcher and implement release changelog
automation for WATcher

Checklist:

• I have tested my changes thoroughly.
• I have created tests for any new code files created in this PR or provided a link to a issue/PR that addresses this.
• I have added or modified code comments to improve code readability where necessary.
• I have updated the project's documentation as necessary.

[vigneshsankariyer1234567890]

LGTM! Thank you for the changes @Arif-Khalid !