Create PULL_REQUEST_TEMPLATE.md

Author: josesimoes

.github/PULL_REQUEST_TEMPLATE.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes/closes/resolves an open issue, please link to the issue here using the template bellow (mind the link as all issues are open in the Home repository, not in this one) -->
+- Fixes/Closes/Resolves nanoFramework/Home#NNNN
+
+## How Has This Been Tested?<!-- (if applicable) -->
+<!--- 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): -->
+
+## Types of changes
+<!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Improvement (non-breaking change that improves a feature, code or algorithm)
+- [ ] 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)
+
+## 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.
+- [ ] I have added tests to cover my changes.
+- [ ] All new and existing tests passed.
+
+<!--- It would be nice if you could sign off your contribution by replacing the name with your GitHub user name and GitHub email contact. -->
+Signed-off-by: GITHUB_USER <GITHUB_USER_EMAIL>