Added pull request template (#138)

Author: GnikDroy

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,56 @@
+IMPORTANT: Please do not create a Pull Request without creating an issue first.
+
+Any change needs to be discussed before proceeding. 
+
+## Description
+Please describe what changes you have made.
+
+For Example:
+
+* Added a file(s) named '...' that implements '...'.
+
+* Changed the algorithm for performance/readablity/bugs.
+
+* Added documentation to the algorithm
+
+
+## Related Issue
+
+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:
+
+## How Has This Been Tested? (Optional)
+
+Please describe in detail how you tested your changes.
+You can skip this if you have not added any tests.
+
+## Screenshots (Optional)
+
+## Types of changes
+
+What types of changes does your code introduce? Put an `x` in all the boxes that apply:
+
+- [ ] Bug fix (change which fixes an issue with the algorithm)
+
+- [ ] New Algorithm (non-breaking change which adds functionality)
+
+- [ ] Documentation
+
+## Checklist:
+Go over all the following points, and put an `x` in all the boxes that apply.
+
+If you're unsure about any of these, don't hesitate to ask. We're here to help!
+
+- [ ] My code follows the code style of this project.
+
+- [ ] My change requires a change to the documentation.
+
+- [ ] I have updated the documentation accordingly.
+
+- [ ] I have read the **CONTRIBUTING** document.
+