Create CONTRIBUTING.md (#8)

Terms To Pull

CONTRIBUTING.md

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+# Thank you for your support and help in the progress of the project.
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+There are some points that I request you to follow for your Pull Requests:
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+1. Please, if you make changes in the main readme (README.md, README.fa.md, README.de.md), take help from the original README.md sample and do not make many changes in appearance and keep the format.
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+2. If you want to create a new language. Please create a main README, then create the steps-.. section and in the corresponding folder, follow the step-by-step tutorial according to the original format of the tutorials (appearance can be maintained and changes can only be made in the texts).
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+3. If you have changed a small section, please provide a full explanation of the reason for the change in that section and if you have created a new file. Explain the reason to us so that the probability of it being merged increases and the explanations are complete and comprehensive
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+4. Please put it in a new branch if you create a new language for the course. And make all your commits in that branch neat and legible so that our team can be faster in merging commits.
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+### Thank you to all the programmers who help us in this way 
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+#### For an open source community ❤️