Add extra requirements.txt ref to the Docs

Signed-off-by: Armin Teimouri <arminteymuri@gmail.com>

README.md

@@ -27,6 +27,7 @@ then run the following steps:
 cp -rfp inventory/sample inventory/mycluster
 
 # Update Ansible inventory file with inventory builder
+# Basides root ``requirements.txt`` , ``inventory builder`` requires some extra Python Packages: ``contrib/inventory_builder/requirements.txt``
 declare -a IPS=(10.10.1.3 10.10.1.4 10.10.1.5)
 CONFIG_FILE=inventory/mycluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]}
 

docs/getting_started/setting-up-your-first-cluster.md

@@ -205,6 +205,10 @@ playbook:
 ```ShellSession
 pip install -r requirements.txt
 ```
+Extra Python Packages are required if you want to use ``inventory builder``:
+```ShellSession
+pip install -r contrib/inventory_builder/requirements.txt
+```
 
 Copy ``inventory/sample`` as ``inventory/mycluster``: