📖 Add pull request template

PULL_REQUEST_TEMPLATE.md

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+THIS PROJECT IS IN MAINTENANCE MODE. We accept pull-requests for Bug Fixes **ONLY**. NO NEW FEATURES ACCEPTED!
+
+---
+
+<!--- Provide a general summary of your changes in the Title above -->
+
+### Description
+<!--- Describe your changes in detail -->
+
+### Related Issue
+
+Fixes #
+<!--- This project only accepts pull requests related to open issues -->
+<!--- If suggesting a new feature or change, please discuss it in an issue first -->
+<!--- If fixing a bug, there should be an issue describing it with steps to reproduce -->
+<!--- Please link to the issue here: -->
+
+### Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+### Types of Changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] ~New feature (non-breaking change which adds functionality)~
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] My code follows the code style of this project.
+- [ ] My change requires a change to the documentation.
+- [ ] I have updated the documentation accordingly.
+- [ ] All new and existing tests passed.
+
+### How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+### Screenshots (if appropriate):