Create CONTRIBUTING.md

Author: ibrahimjelliti

CONTRIBUTING.md

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+# Contributing Guidelines
+
+Welcome to NLP Specialization. I created this repo to collect all notes and summary on this brand-new specialization from [deeplearning.ai](https://www.deeplearning.ai/)
+
+## Getting Started
+I made the repo structure same as the course, each numbred-folder is a course. 
+under each course folder, you find a readme file contains the summary on all course weeks with pictures and in simple way.
+Labs and assignments of each week are under the lab folder with all its dependencies, so you can run it on your local Jupyter server.
+I added several docs and code issues you can contribute at the repo [Issues](https://github.com/ijelliti/Deeplearning.ai-Natural-Language-Processing-Specialization/issues)
+All the contributions are done via GitHub.
+
+### Create a patch
+
+1. Submit an issue by describing your proposed change to the repo in question.
+2. The repo owners will respond to your issue rapidly.
+3. Fork the repo make your changes and test it.
+4. Submit a pull request.
+
+### Get through review process
+
+All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose.
+
+## Contact Information
+
+- Twitter: [@IbrahimJelliti](https://twitter.com/IbrahimJelliti)
+- LinkedIn: [@ijelliti](https://www.linkedin.com/in/ijelliti/)
+- the specialization slack channel:  @ibrahim