Added a pull request template

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

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+<!-- See CONTRIBUTING.md for general guidelines on contributions. -->
+<!-- Don't forget to target your pull request exclusively against the `dev` branch. -->
+
+## Description
+
+<!-- What does the pull request do? -->
+<!-- Provide background on the PR, including links to related issues, etc. -->
+
+## Current Behavior
+
+<!-- If the PR is a fix, describe the current incorrect behavior. Otherwise, delete this section. -->
+
+## Updated Behavior
+
+<!-- If the PR is a fix, describe the updated/expected behavior. Otherwise, delete this section. -->
+
+## Implementation Notes
+
+<!-- How was the solution implemented (if it's not obvious)? -->
+<!-- Include any information that might be useful to a reviewer here, if any. Otherwise, delete this section. -->
+
+## Checklist
+
+ - [ ] Added unit tests for every exported function/class.
+ - [ ] Added JSDoc to every public function/class/class member.
+ - [ ] Added relevant information to the README.
+
+## Breaking Changes
+
+<!-- List any breaking changes here, if any. Otherwise, delete this section. -->
+
+## Fixed Issues
+
+<!--
+
+If the pull request fixes issue(s), list them like this:
+
+Fixes #123
+Fixes #456
+
+Otherwise, delete this section.
+
+-->