Add instructions for executing using root in venv

Author: erget

02_Code/README.md

@@ -1,5 +1,5 @@
 # FSEDevBoard package
- 
+
 ## Installing
       % sudo apt install python3 python3-pip
       % pip3 install virtualenv
@@ -14,5 +14,8 @@
       (venv) % pip3 install FseDevBoard-0.0.1.tar.gz
 
 ### Running the PDC example
-     (venv) % cd ../../applications
-     (venv) % python3 PDC.py
+Note: Because applications using PWM must have root privileges, it is necessary to switch to root so that the venv is respected.
+      % sudo su
+      % source venv/bin/activate
+      (venv) % cd ../../applications
+      (venv) % python3 PDC.py