Add file to know the current versions of HAL drivers

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

system/Drivers/STM32YYxx_HAL_Driver_version.md

@@ -0,0 +1,17 @@
+# STM32YYxx HAL Drivers version:
+
+  * STM32F0: 1.6.0 
+  * STM32F1: 1.0.4
+  * STM32F2: 1.2.1 
+  * STM32F3: 1.4.0
+  * STM32F4: 1.7.1
+  * STM32F7: 1.2.2
+  * STM32L0: 1.8.1
+  * STM32L1: 1.3.0
+  * STM32L4: 1.7.1
+
+Release notes of each STM32YYxx HAL Drivers available here:
+
+`system/Drivers/STM32YYxx_HAL_Driver/Release_Notes.html`
+
+Where 'YY' is the STM32 MCU series.