SRCH-2457 add pull request template (#774)

.github/pull_request_template.md

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+## Summary
+- Brief summary of the changes included in this PR
+- Any additional information or context which may help the reviewer
+
+### Checklist
+Please ensure you have addressed all concerns below before marking a PR "ready for review" or before requesting a re-review:
+
+#### Functionality Checks
+
+- [ ] Code is functional.
+
+- [ ] Automated checks pass, if applicable. If Code Climate checks do not pass, explain reason for failures:
+
+- [ ] If your changes will be tested manually, you have run `bundle update` and committed your changes to Gemfile.lock.
+
+- [ ] You have merged the latest changes from the target branch (usually `master` or `main`) into your branch.
+
+- [ ] If your target branch is NOT `master` or `main`, specify the reason:
+
+- [ ] PR title is either of the format **SRCH-#### \<description\>** matching the associated Jira ticket (i.e. "SRCH-123 implement feature X"), or **Release #.#.#** matching the release number
+
+- [ ] You have squashed your commits into a single commit (exception: your PR includes commits with formatting-only changes, such as required by Rubocop)
+
+- [ ] Your primary commit message is of the format **SRCH-#### \<description\>** matching the associated Jira ticket
+
+#### Process Checks
+
+- [ ] You have specified an "Assignee", and if necessary, additional reviewers