Added README.md for the server

Server/README.md

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+# zoom-attendance-check API
+
+API doc can be found [here](https://documenter.getpostman.com/view/4335694/TVRg694k)
+
+## Requirements
+1. Install python 3 and pip
+2. `pip install -r requirements.txt`
+3. `python run.py`
+
+API will be running now at: `http://localhost:5000`
+
+## Project structure
+The server code is inside Server package, and can be runned with the external module `run.py`.
+We decided to use `flask-restful` extenstion in order to create the endpoints, and `flaks-sqlalchemy` in order to create the database.
+
+The inside the `Server` package is organzied into the following sub-packages:
+
+- `api` - package which is responsible for the api endpoints
+- `utils` - general utils for the application
+
+also there are:
+
+- `models.py` - ORM models for the database
+- `config.py` - genreal settings for the application