Add more compilation details (#21)

README.md

@@ -29,6 +29,8 @@ pip3 install prettytable future jinja2 intelhex
 Custom packages inside of the `extra_packages` folder will be included on the micro-ROS library build.
 This allows the use of custom messages or other ROS packages.
 
+To rebuild the microros lib after including new packages, you can run `make -f libmicroros.mk clean` before `mbed-tools compile`
+
 ## Example
 
 In order to test a int32_publisher example:
@@ -38,6 +40,11 @@ mbed-tools deploy
 mbed-tools compile -m DISCO_L475VG_IOT01A -t GCC_ARM -f
 ```
 
+| Board | -m |
+| ----------------------------| ------------------- |
+| Arduino Portenta H7 M7 Core | PORTENTA_H7_M7 |
+| Arduino Disco IOT | DISCO_L475VG_IOT01A |
+
 Is possible to use a micro-ROS Agent just with this docker command:
 
 ```bash