Include mypy instructions in CONTRIBUTING.md (#4271)

* reupload * Include mypy instructions * delete file * fixed trailing whitespaces * options before file path Co-authored-by: Christian Clauss <[email protected]>
TheAlgorithms · Mar 19, 2021 · ffa53c02a7da4ac4149a8ee1b14d4f023d2e2d78 · ffa53c0
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@@ -155,6 +155,8 @@ We want your work to be readable by others; therefore, we encourage you to note
       return a + b
   ```
 
+  Instructions on how to install mypy can be found [here](https://github.com/python/mypy). Please use the command `mypy --ignore-missing-imports .` to test all files or `mypy --ignore-missing-imports path/to/file.py` to test a specific file.
+
 - [__List comprehensions and generators__](https://docs.python.org/3/tutorial/datastructures.html#list-comprehensions) are preferred over the use of `lambda`, `map`, `filter`, `reduce` but the important thing is to demonstrate the power of Python in code that is easy to read and maintain.
 
 - Avoid importing external libraries for basic algorithms. Only use those libraries for complicated algorithms.