Added initial pull request template for rust-lang#11

Author: TheDan64

PULL_REQUEST_TEMPLATE.md

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+<!--- This version of the form is by no means final -->
+<!--- Provide a brief summary of your changes in the title above -->
+
+## Description
+
+<!--- Describe your changes in detail -->
+
+## 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 -->
+
+## Motivation and Context
+
+<!--- Why is this change required? What problem does it solve? -->
+
+## How Has This Been Tested?
+
+<!--- 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. -->
+
+## 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)
+
+## 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! -->
+
+### Required
+
+- [ ] My code follows the code style of this project
+- [ ] I have added or updated documentation (and doc tests) to any new or changed functions or types
+- [ ] I have added tests to cover my changes
+- [ ] All new and existing tests passed
+
+<!--- This does not exist yet: -->
+<!--- [ ] I have read the **CONTRIBUTING.md** document. -->
+
+### Desired
+
+- [ ] I have ran clippy and updated portions of code pertaining to my changes