New feature: Adds commenting feature

You can now add an optional message to comment on the issue someone assigns themselves to.

# .github/workflows/take.yml 
name: Assign issue to contributor
on: 
  issue_comment:

jobs:
  assign:
    name: Take an issue
    runs-on: ubuntu-latest
    steps:
    - name: take the issue
      uses: bdougie/take-action@main
      env:
        GITHUB_TOKEN: ${{ github.token }}
      with:
        message: Thanks for taking this issue! Let us know if you have any questions!