Added command packet explanation to readme

README.md

@@ -1,2 +1,14 @@
-# Example Arduino Code For My Serial Communications Protocol
+# Example Arduino Code For The Serial Communications Protocol
 
+This is an Arduino example/library of my serial communications protocol which implements checksums, acknowledge and repeat commands to normal serial communication, while still keeping the end user experience simple and intuitive. 
+
+## Command Packet Contents 
+Bellow is an illustration of a command packet which is sent out by the library.
+
+![image](docs/CommandPacket.png)
+
+Each command packet consists of an instructions packet, a checksum and an end bit, with each part being seperated by a separator bit. The istructions packet consists of a command and a data part, which are again separated by a bit. In the current form of the protocol the separator bit is a `#` and the terminator bit is a `@`. 
+
+An example command would look something like this `ERR#Something went wrong#4324@`. In the above example we are sending a command `ERR` with the arguments of `Something went wrong` and the `4324` is an auto generated checksum.
+
+All the data is currently being transmitted in plain-text, however in future versions of the library they will be encoded in hex and sent that way.