Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!--- Describe your changes in detail -->
+
+### Issue link:
+
+### What is the current behavior?
+
+### What is the new behavior (if this is a feature change)?
+
+### Screenshots (if applicable)
+
+## Review Time Estimate
+<!---When do you want your code reviewed by?-->
+- [ ] Immediately
+- [ ] Within one week
+- [ ] When possible
+
+## Types of changes (select all that applies)
+<!--- 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) <!-- please add issue number -->
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Improvement
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+## 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 change requires a change to the documentation.
+- [ ] I have updated the CHANGELOG.md.
+- [ ] This changeset requires updating dependencies.
+- [ ] I have updated the documentation accordingly.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.