Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+  Thanks for contributing!
+
+  Provide a description of your changes below and a general summary in the title
+
+  Please look at the following checklist to ensure that your PR can be accepted quickly:
+-->
+
+## Description
+
+<!--- Describe your changes in detail -->
+
+## Issue link
+
+If your PR closes an issue, use the `closes` keyword followed
+by its link, for example: 
+
+> closes https://github.com/nank1ro/awesome_flutter_extensions/issues/{ISSUE_NUMBER}
+
+replacing `{ISSUE_NUMBER}` with the number, like: `1`
+
+## Type of Change
+
+<!--- Put an `x` in all the boxes that apply: -->
+
+- [ ] ✨ New feature (non-breaking change which adds functionality)
+- [ ] 🛠️ Bug fix (non-breaking change which fixes an issue)
+- [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] 🧹 Code refactor
+- [ ] 📝 Documentation
+- [ ] 🗑️ Chore