Instructions for python libraries installation added

README.md

@@ -1,2 +1,18 @@
 # PythonPostgresLab
 A CLI (Command Line Interface) written in python to query a PostgreSQL database. Lab realized as a student at Ecole Centrale de Nantes (ECN).
+
+## Prerequisites
+
+### PyInquirer
+
+For easy CLI python interfaces :
+`sudo pip3 install pyinquirer`
+
+### Postgres
+
+To install PostgreSQL driver :
+`sudo pip3 install postgres`
+
+## PostgreSQL database
+
+I suppose that you already have a running instance of postgreSQL. The schema is a model of a logistics company.