adding formatting steps in pull request template (#4606)

* adding formatting steps in contribution.md

* adding format to pull request template

* made format instruction shorter

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Co-authored-by: Piotr Idzik <[email protected]>

Author: asapekia

.github/pull_request_template.md

@@ -13,3 +13,4 @@ In order to reduce the number of notifications sent to the maintainers, please:
 - [ ] All filenames are in PascalCase.
 - [ ] All functions and variable names follow Java naming conventions.
 - [ ] All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
+- [ ] All new code is formatted with `clang-format -i --style=file path/to/your/file.java`

CONTRIBUTING.md

@@ -28,4 +28,4 @@ NOTE: *Please avoid opening issues asking to be "assigned" to a particular algor
 
 - Ask any question about how to use the repository in the [TheAlgorithms room in GITTER](https://gitter.im/TheAlgorithms/community?source=orgpage#) or [open a new issue](https://github.com/TheAlgorithms/Java/issues/new)
 
-:+1::tada: That's all you need to know about the process now it's your turn to help us improve the repository, thank you again! :+1::tada:
+:+1::tada: That's all you need to know about the process now it's your turn to help us improve the repository, thank you again! :+1::tada: