docs updated

README.md

@@ -9,13 +9,22 @@ This is a little similar implementation of `genpy` for uPy. In order to use ross
 - [ ] Services
 
 ## Installation
+
+### Copying source files
 In order to use this package the folder `ugenpy` from `src` must be copied to the flash memory. I strongly recommend using [rshell](https://github.com/dhylands/rshell) for this task. 
 
 There is also a folder called `std_msgs` which has all default `*.msg` files, this folder can also be copied or any other folder with the wanted message types. For memory purposes not all the `msg` files in that folder must be copied, only the ones that are going to be used.
 
-You can also install `ugenpy` with but have in mind the `.msg` files must be copied, located in the corresponding dir:
+### Using upip
+You can also install `ugenpy` with upip but have in mind the `.msg` files must be copied, located in the corresponding dir:
 ``` python
 import upip
+import network
+from time import sleep
+wlan=network.WLAN(network.STA_IF)
+wlan.active(True)
+wlan.connect('<ssid>', '<password>')
+sleep(5)
 upip.install('micropython-genpy')
 ```
 >Note: To use upip you must be connected to WiFi and the files with std_msgs dir must be included manually.
@@ -36,3 +45,14 @@ import os
 os.listdir('std_msgs')
 ```
 
+## Classes
+### `ugenpy.message.MessageGenerator`
+#### Constructor
+##### `ugenpy.message.MessageGenerator(addr)`
+Class responsible of writing the `*.py` script and message class from `*.msg`.
+* `addr`: address where the `.msg` file is located inside the microcontroller.
+
+#### Methods
+##### `ugenpy.message.MessageGenerator.create_message()`
+Creates the message from the address already defined in constructor.
+