Add PR template

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+Description of the problem. Link to an issue if one exists.
+
+## Solution
+
+A description of what this Pull Request contains in terms of a solution. Include a synopsis of how you achieved this (include any additonal libraries you may have used). If code is reused from elsewhere, reference the GitHub repository line number URL.
+
+## Screenshots
+
+List of screenshots. Use `![image name](image url)` to display an image.
+
+## Known limitations
+
+List any known limitations of this solution.
+
+Any updates should be referenced at the bottom. In the following format `_**Updated: YYYY/MM/DD 00:00**_`