Create PROJECTS.md for data-science path

Author: Mahdi Dibaiee

PROJECTS.md

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+<h3 align="center">Open Source Society University</h3>
+<p align="center">
+	<i>Knowledge and skills as commons</i>
+</p>
+
+<h4 align="center">Projects ideas</h4>
+
+>Here, we are providing a list curated by the community of exercices and projects to practice and reinforce the skills we try to master.
+
+Projects created by OSSU's students for each course of our [**Data Science**](https://github.com/open-source-society/data-science) curriculum.
+
+### Linear Algebra
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+ 
+### Single Variable Calculus
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Multivariable Calculus
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Python
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Probability and Statistics
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Introduction to Data Science
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Machine Learning
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Convex Optimization
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+
+### Big Data
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Database
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Natural Language Processing
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |
+
+### Deep Learning
+Project Title | Description | Authors | Repository
+:-- | :-- | :--: | :--
+| | |