Update README.md

## Installation

so far, the project is not using specific dependencies other than the basic python module

the project is using specific dependencies other than the basic python module

I developped it using Python 3.8.2

clone the repo with

###clone the repo with

```

git clone https://gitlab.anthony-jacob.com/anthony.jacob/python-snake.git

```

###create a Python virtual environment

```

cd python-snake

python main.py

python -m venv venv

```

###activate the Virtual environment

with Windows command:

`venv\Scripts\activate.bat`

with powershell:

`venv/bin/Activate.ps1`

with bash:

`source <venv>/bin/activate`

###install the dependencies

`pip install -r requirements.txt`

###run 

`python main.py`

## Play

there is a intermediary menu where you can exit or choose the play mode (only in terminal for now)