DOCSP-37263: add set option for PS users (#182)

* DOCSP-37263: add set option for PS users

* edit:

Author: rustagir

source/quick-start.txt

@@ -49,6 +49,15 @@ code.
 
    export MONGODB_URI="<your MongoDB URI>"
 
+.. note:: PowerShell Environment Variables
+
+   If you are using Microsoft PowerShell, run the following command to
+   save your connection string in an environment variable:
+   
+   .. code-block:: bash
+   
+      set MONGODB_URI="<your MongoDB URI>"
+
 .. important::
 
    Make sure to replace the ``<username>`` and ``<password>`` sections of the connection