Updated README

README.md

@@ -3,18 +3,26 @@
 * Python 3.9
 * Set up virtual env
 
+```
     % python3.9 -m venv caster_env
     % source caster_env/bin/activate
 
     % python3.9 -m pip install --upgrade pip
     % pip install urwid pychromecast nest_asyncio
+```
 
 # Debug flow
 
-In run terminal - redirect STDERR from caster to an output file:
+In run terminal - redirect `STDERR` from caster to an output file:
 
+```
 % ./caster.py 2> ste
+```
+
 
 In another terminal, monitor the output file:
 
+```
 % tail -f ste
+```
+