Add a pull request template (#208)

* Add a pull request template

* Add link to CoC and contributing guidelines

* Removee top comments

Author: Panquesito7

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,31 @@
+### Description
+
+<!-- Provide a description of the introduced changes in this pull request. -->
+<!-- If the pull request closes an issue, please update the issue ID below. -->
+
+Closes #{ISSUE_ID} <!-- Remove if not applicable -->
+
+### Checklist
+
+- [ ] A description of the changes in this PR is mentioned above.
+- [ ] All the new and existing checks pass.
+- [ ] No plagiarized, duplicated, or repetitive documentation that has been directly copied from another source.
+- [ ] If it's a new explanation, it contains solid, understandable, and accessible information.
+- [ ] I have read the whole [contributing guidelines](https://github.com/TheAlgorithms/Algorithms-Explanation/blob/master/CONTRIBUTING.md) and agree to the [Code of Conduct](https://github.com/TheAlgorithms/.github/blob/master/CODE_OF_CONDUCT.md).
+
+### Screenshots (if any)
+
+<!--
+
+If any, add screenshots to help explain your changes.
+Remove these comments to highlight the screenshots in the PR.
+
+|      Original       |      Updated       |
+| :-----------------: | :----------------: |
+| original screenshot | updated screenshot |
+
+-->
+
+### Note to reviewers
+
+<!-- Please add a one-line description for developers or pull request viewers, if any. -->