Add Astyle configuration file for mbed OS
Add Astyle configuration file for mbed OS

This follows what is in the codebase in most cases (K&R with few exceptions).
This should follow also how online compiler formats the code.

c1728p9/mbed-os,andcor02/mbed-os,betzw/mbed-os,c1728p9/mbed-os,betzw/mbed-os,mbedmicro/mbed,mbedmicro/mbed,c1728p9/mbed-os,mbedmicro/mbed,betzw/mbed-os,c1728p9/mbed-os,c1728p9/mbed-os,andcor02/mbed-os,kjbracey-arm/mbed,andcor02/mbed-os,betzw/mbed-os,mbedmicro/mbed,andcor02/mbed-os,kjbracey-arm/mbed,betzw/mbed-os,c1728p9/mbed-os,andcor02/mbed-os,andcor02/mbed-os,kjbracey-arm/mbed,betzw/mbed-os,kjbracey-arm/mbed,mbedmicro/mbed