Finalized Repository

CONTRIBUTING.md

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+# Contributing guidelines
+
+## Before contributing
+
+Welcome to [Daily Coding Problem Solutions](https://github.com/ruppysuppy/Daily-Coding-Challenge-Solutions)!
+Before sending your pull requests, make sure that you read the whole guidelines.
+
+## Contributing
+
+### Contributor
+
+Thankyou for considering improvising the solutions in this repository! Being one of our
+contributors, you agree and confirm that:
+
+-   Your work will be distributed under [MIT License](LICENSE.md) once your pull
+    request is merged.
+-   You submitted work fulfils the styles and standards of this repository.
+
+### Contribution
+
+Any contribution, from fixing a grammatical mistake in a comment to improvising current
+solutions is appriciated.
+
+**New implementation** is welcome as long as the solution improvises the
+`Time Complexity` and/or `Space Complexity` without deteriorating the either of them
+compared to the current solution! But **identical implementation** of an existing
+solution is not allowed.
+
+**Improving comments** are also highly welcome. But **fake pull requests**, like
+_unnecessarily changing the wording or adding 'a' or 'the', are highly discouraged_.
+Such pull requests will be closed immediately and labeled as `invalid`.
+
+### Other Requirements for Submissions
+
+-   Use [black](https://pypi.org/project/black/) to format you code.
+-   Strictly use **PascalCase** for class names and**snake_case** in your variable and
+    function names.
+-   If you have modified/added code work, make sure the code compiles before
+    submitting.
+-   If you have modified/added documentation work, ensure your language is concise and
+    contains no grammatical errors.
+-   Do not update the README.md file.
+-   Make sure to add
+    [**Python type hints**](https://docs.python.org/3/library/typing.html) to all
+    functions and methods.
+-   Make sure to follow this pattern for any solution:
+
+    ```python
+    """
+    Problem:
+
+    <Problem Statement>
+    """
+
+    # ...
+    # necessary functions
+    # ...
+
+
+    if __name__ == "__main__":
+        # an example for the solution
+
+
+    """
+    SPECS:
+
+    <time & space complexity>
+    """
+    ```
+
+-   Most importantly,
+    -   **Be consistent in the use of these guidelines when submitting.**
+    -   Happy coding!