chore: added pr template

.github/PULL_REQUEST_TEMPLATE.md

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+### Purpose
+
+(FILL ME IN) This section describes why this PR is here. Usually it would include a reference to issues.
+
+### Declarations
+
+Check these if you believe they are true
+
+- [ ] The codebase is in a better state after this PR
+- [ ] Has linting/formatting been run? (`make lint`, `make format`, `make check`)
+- [ ] Was it tested locally? (`make test`)
+- [ ] Has the changelog been updated?
+- [ ] Have the docs been updated?
+- [ ] The level of testing this PR includes is appropriate
+
+### Reviewers
+
+(FILL ME IN) Reviewer 1 (If possible, assign the Reviewer for the PR)
+(FILL ME IN, Optional) Any additional notes to reviewers or testers.
+
+### FYIs
+
+(FILL ME IN, Optional) Names of anyone else you wish to be notified of
+
+#### Notes
+
+(FILL ME IN, Optional) Additional context to this PR.