Add pull request template

.github/pull_request_template.md

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+# Description
+
+Please include a summary of the change and which issues are fixed. Please also include relevant motivation and context.
+
+Fixes:
+- Link to Clubhouse story
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- Frontend only. Little-to-no backend code was modified.
+- Backend only. Does not require any frontend code changes.
+- Affects the pipeline, (ETLs, Workers, Periodic).
+- Requires a DB migration to be run.
+- Affects signup/login/onboarding.
+- Affects billing/pricing.
+- Has required changes in other repos, (LIST THEM HERE).
+- Other (styles, tests, build, etc).
+
+---
+
+[PR Guidelines](https://github.com/rollbar/internal/blob/master/code-style/GUIDELINES.md)