Add Readme file

README.md

+# Omnicrobe Web interfaces
+
+[![Python](https://img.shields.io/badge/python-3.7.6-brightgreen.svg)](https://www.python.org/)
+[![Flask](https://img.shields.io/badge/flask-1.1.2-brightgreen.svg)](https://flask.palletsprojects.com/en/2.0.x/quickstart/)
+[![Flask_restx](https://img.shields.io/badge/flask_restx-0.2.0-brightgreen.svg)](https://flask-restx.readthedocs.io/en/latest/)
+[![Psycopg2](https://img.shields.io/badge/psycopg2-2.8.6-brightgreen.svg)](https://pypi.org/project/psycopg2/)
+
+## Source code
+
+```bash
+$ git clone git@forgemia.inra.fr:omnicrobe/omnicrobe_web.git
+```
+
+## How to run Omnicrobe?
+
+### Configuration file
+
+Before running the Omnicrobe application, it is necessary to modify the `config.yaml` configuration file with database connection information.
+
+### Execution environment
+
+```bash
+$ python3 -m venv venv
+
+$ . venv/bin/activate
+
+$ pip install Flask
+$ pip install psycopg2
+$ pip install flask-restx
+
+$ export FLASK_APP=__init__.py
+$ export FLASK_ENV=development
+```
+
+### Workflow execution
+
+```bash
+$ flask run
+```