Add PR template

Author: sushmi21

.github/pull_request_template.md

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+# Success criteria
+Please describe what should be possible after this change. List all individual items on a separate line.
+
+- A
+- B
+- C
+
+# How to test
+Please describe the individual steps on how a peer can test your change.
+
+1. A
+2. B
+3. C
+
+# Security
+- [ ] Possible injection vector
+- [ ] Authentication/Access controls touched
+- [ ] Sensitive Data could be exposed
+- [ ] XSS
+- [ ] Logging/Monitoring touched
+- [ ] Exchanges data with external systems
+- [ ] No security implications
+
+# Additional considerations
+- [ ] This PR might have performance implications