add a pull request template

[anilbey]

Adds the PR template below that reminds us the checklist items to be checked before merging (e.g. add test, docs, changelog).

# Pull Request Template

## Description

Please include a summary of the change.
By default the change will increment the patch version, to increment major or minor changes add #major or #minor to the PR description.


## Checklist:
- [ ] Unit tests are added to cover the changes.
- [ ] The changes are mentioned in the documentation.
- [ ] CHANGELOG.md is updated (skip if the change is not important for the changelog).

[darshanmandge]

Great! If you want, you can also add an issue template

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b7c2f60) 56.47% compared to head (225d13f) 56.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #342   +/-   ##
=======================================
  Coverage   56.47%   56.47%           
=======================================
  Files          30       30           
  Lines        7727     7727           
  Branches     3274     3274           
=======================================
  Hits         4364     4364           
  Misses        843      843           
  Partials     2520     2520           

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