Add a Pull Request Template (rust-lang#295)

Author: erfan-khadem

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -0,0 +1,27 @@
+# Pull Request Template
+
+## Description
+
+Please include a summary of the change and which issue (if any) is fixed.
+A brief description of the algorithm and your implementation method can be helpful too. If the implemented method/algorithm is not so
+well-known, it would be helpful to add a link to an article explaining it with more details.
+
+## Type of change
+
+Please delete options that are not relevant.
+
+- [ ] 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 not work as expected)
+
+## Checklist:
+
+- [ ] I ran bellow commands using the latest version of **rust nightly**.
+- [ ] I ran `cargo clippy --all -- -D warning` just before my last commit and fixed any issue that was found.
+- [ ] I ran `cargo fmt` just before my last commit.
+- [ ] I ran `cargo test` just before my last commit and all tests passed.
+- [ ] I checked `COUNTRIBUTING.md` and my code follows its guidelines.
+
+Please make sure that if there is a test that takes too long to run ( > 300ms), you `#[ignore]` that or
+try to optimize your code or make the test easier to run. We have this rule because we have hundreds of
+tests to run; If each one of them took 300ms, we would have to wait for a long time.