Add instructions to compile without RTOS.

Author: microbit-carlos

.mbedignore

@@ -1 +1,30 @@
-examples/*
+examples/*
+
+# Uncomment the following entries to compile without RTOS
+# mbed-os/rtos/*
+# mbed-os/usb/*
+# mbed-os/features/cellular/*
+# mbed-os/features/cryptocell/*
+# mbed-os/features/FEATURE_BLE/*
+# mbed-os/features/FEATURE_CLIENT/*
+# mbed-os/features/FEATURE_COMMON_PAL/*
+# mbed-os/features/FEATURE_UVISOR/*
+# mbed-os/features/frameworks/*
+# mbed-os/features/net/*
+# mbed-os/features/netsocket/*
+# mbed-os/features/nanostack/*
+# mbed-os/features/nvstore/*
+# mbed-os/features/storage/*
+# mbed-os/features/device_key/*
+# mbed-os/features/lorawan/*
+# mbed-os/features/lwipstack/*
+# mbed-os/features/mbedtls/*
+# mbed-os/features/nanostack/*
+# mbed-os/features/netsocket/*
+# mbed-os/features/nfc/*
+# mbed-os/features/storage/*
+# mbed-os/features/unsupported/*
+# mbed-os/events/*
+# mbed-os/components/802.15.4_RF/*
+# mbed-os/components/storage/*
+# mbed-os/components/wifi/*

README.md

@@ -27,6 +27,7 @@ This is a basic Mbed OS project for [micro:bit V2](https://microbit.org/new-micr
 - pip (version >= 10.0)
 - Mercurial
 - [Mbed CLI](https://github.com/ARMmbed/mbed-cli)
+    - Last tested version is 1.10.2
 
 **Make only requirements:**
 - srec_cat
@@ -78,6 +79,11 @@ this is the last version to support Soft Device, which has been dropped in
 > SoftDevice Bluetooth stack is not supported. Bluetooth remains supported with
 > the help of Arm's Cordio stack.
 
+### Mbed OS RTOS
+
+To compile the project without the Mbed OS RTOS edit the `.mbedignore` and
+uncomment all the entries.
+
 ### Initialise
 
 Note that for the `mbed target ...` line you should select the right target