Actualiser pgadmin4/install.md

pgadmin4/install.md

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+Create a Python virtual environment:
+
+```
+python3 -m venv pgadmin4
+```
+
+Navigate to the new directory and create some necessary folders:
+
+```
+cd ~/pgadmin4mkdir varmkdir var/storagemkdir var/sessions
+```
+
+Activate the virtual environment:
+
+```
+source /home/pi/pgadmin4/bin/activate
+```
+
+Install the Python _pgadmin4_ package:
+
+```
+pip install pgadmin4
+```
+
+This is an official package available in PyPi, maintained by the pgAdmin Development Team, that allows us to run pgAdmin as a **Flask** web application.