Add pull request template to all conenct repos

Author: xiangxin72

docs/pull_request_template.md

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+## Problem
+
+
+## Solution
+
+
+<!--- Mark x in the box. -->
+##### Does this solution apply anywhere else?
+- [ ] yes
+- [ ] no
+
+##### If yes, where?
+
+
+## Test Strategy
+
+
+<!--- Mark x in the box for all that apply. -->
+##### Testing done:
+- [ ] Unit tests
+- [ ] Integration tests
+- [ ] System tests
+- [ ] Manual tests
+
+## Release Plan
+<!--- Describe the release plan for this feature. -->
+<!-- Are you backporting or merging to master? -->
+<!-- If you are reverting or rolling back, is it safe? -->