Update pull_request_template.md

[BenTaylor-TfN]

Describe Changes

Added some text to the PR template to prompt people to fill in this first section

Task Checklist

• [ ] Have unittests been added (testing individual functions and their edge cases)
• [ ] Have integration tests been added (if applicable, to test modules of functionality)
• [ ] Have new dependencies been added?
  • [ ] Have they been added to either requirements.txt or requirements_dev.txt.
  • [ ] Have they been added to pyproject.toml

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.85%. Comparing base (6750c25) to head (a11cfd7). Report is 43 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #146 +/- ## ========================================== - Coverage 91.30% 89.85% -1.45% ========================================== Files 22 22 Lines 1495 1518 +23 ========================================== - Hits 1365 1364 -1 - Misses 130 154 +24 ```

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