Create PULL_REQUEST_TEMPLATE.md

Author: muthurathinam

PULL_REQUEST_TEMPLATE.md

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+A similar PR may already be submitted!
+Please search among the [Pull request](https://github.com/microsoftgraph/msgraph-sdk-javascript/pulls) before creating one.
+
+Thanks for submitting a pull request! Please provide enough information so that others can review your pull request.
+
+## Summary
+
+<!-- Summary of the PR -->
+
+## 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)
+- [ ] I have read the **CONTRIBUTING** document.
+- [ ] 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 added tests to cover my changes.
+- [ ] All new and existing tests passed.
+
+Explain the **motivation** for making this change. What existing problem does the pull request solve?
+
+<!-- Example: When "Adding a function to do X", explain why it is necessary to have a way to do X. -->
+
+## Test plan (required)
+
+Demonstrate the code is solid. Example: The exact commands you ran and their output.
+
+<!-- Make sure tests pass on Travis CI. -->
+
+## Closing issues
+
+<!-- Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such). -->
+Fixes #