pull request template added

PULL_REQUEST_TEMPLATE.md

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+**Fix Issue (if any or simply type `NIL`) :**
+
+<!--Enter the issue number you opened pull request for, otherwise write `NIL`-->
+
+**Related To:**
+
+<!--Fill the empty space in between [ and ] with x to check the type of pull request-->
+
+- [ ] Readme / Docs
+- [ ] Bug Fix
+- [ ] New Feature
+- [ ] Enhancement
+
+**Changes Made**
+
+<!-- short description but more than commit message -->