Initialised the PR Template

.github/PULL_REQUEST_TEMPLATE.md

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+<!---
+    Thank you for contributing to Circle CI.
+    Fields marked with (*) are required. Please don't remove the template.
+-->
+
+## Description (*)
+<!---
+   Please provide a brief description of this PR.
+-->
+
+## Fixed Issues (if necessary)
+<!---
+    Please mention all the relevant issues this PR fixes.
+-->
+
+## Screenshots (if necessary)
+<!---
+  Provide relevant screenshots for the error fixed or the feature introduced. You can upload JPEGs, PNGs, or GIFs.
+-->
+
+## Contribution checklist (*)
+ - [ ] I have read the Contributing Guidelines
+ - [ ] Commits have been made with meaningful commit messages
+ - [ ] All automated tests have passed successfully 
+