Update documentation

README

@@ -1,32 +1,37 @@
 ## Serial Interface
 
-Instead of polling for input we use an interrupt vector
+  Instead of polling for input we use an interrupt vector
-to write data to a rx ring buffer when it's available.
+  to write data to a rx ring buffer when it's available.
 
-We parse commands using a state machine so we can deal
+  We parse commands using a state machine so we can deal
-with small chunks of characters at a time and spit out
+  with small chunks of characters at a time and spit out
-the parsed command when the transmission has finished.
+  the parsed command when the transmission has finished.
 
-TODO: System clock frequency should be a multiple of
+  TODO: System clock frequency should be a multiple of
-1.8432MHz for perfect USART. This means we would need
+  1.8432MHz for perfect USART. This means we would need
-an external crystal oscillator.
+  an external crystal oscillator.
-
-TODO: Do we need to handle backspaces for interactive
-serial consoles?! Overkill?!
 
 ### Supported Commands
 
-Optional decimal point for numbers.
+  - RUN
+  - STOP
+  - TEMP <float>
+  - DEWP <float>
 
-- START
+  Decimal point for numbers is optional. Make sure you
-- RESET
+  have disabled hardware flow control on the client side.
-- STOP
+
-- SET TEMP 20.0
+  TODO: Do we need to handle backspaces for interactive
-- SET DEWP 60.0
+  serial consoles?! Overkill?!
 
 ### Web Interface Example
 
-There is a little example web interface you can check
+  There is a little example web interface you can check
-out in the opt/webgui directory. This simple php page
+  out in the opt/webgui directory. The simple php page
-demonstrates how you can create a custom interface for
+  demonstrates how you can create a custom interface for
-your drybox. For more info see the README file there.
+  your drybox. For more info see the README file there.
+
+  You may need to run the following command to load the
+  optional submodules if you can't see the webgui folder:
+
+    git submodule update --init