mod_power_capping_hal: Add a .md file to power capping HAL
Add a .md file to power capping HAL explaining how it uses PID controller module and how it integrates with the rest of the system.
Signed-off-by: Mahmoud Elsabbagh mahmoud.elsabbagh@arm.com
Add a .md file to power capping HAL explaining how it uses PID controller module and how it integrates with the rest of the system.
Signed-off-by: Mahmoud Elsabbagh mahmoud.elsabbagh@arm.com