add PULL_REQUEST_TEMPLATE.md file

Author: webmasterish

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,20 @@
+<!-- please provide a general summary of your changes in the title above -->
+
+
+## Description
+
+<!-- describe the changes in details -->
+<!-- if it fixes an open issue, please link to the issue here -->
+
+
+## Checklist
+
+<!-- put an `x` in all the boxes that apply -->
+
+- [ ] All tests are passing
+- [ ] My code follows the code style and structure of this project
+
+
+<!-- feel free to add any other relevant details -->
+
+<!-- thanks! -->