restructuring

F0:F030,F042,F072/Servo/Readme.md

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+Servo motors SG-90 management
+=============================
+
+## GPIO
+- PA0..PA3 - 4 ADC inputs
+- PA6 - (TIM3_CH1) - Servo1,
+- PA7 - (TIM3_CH2) - Servo2,
+- PA9 - (USART_Tx) - TX,
+- PA10 - (USART_Rx) - RX,
+- PB1 - (TIM3_CH4) - Servo3,
+- PF1 - (OpenDrain) - external LED or laser (0 - active)
+
+## UART 
+115200N1, not more than 100ms between data bytes in command.
+To turn ON human terminal (without timeout) send "####".
+
+## Protocol
+All commands are in brackets: `[ command line ]`.
+
+'[' clears earlier input; '\n', '\r', ' ', '\t' are ignored.
+All messages are asynchronous!
+
+## Commands
+* **d** - debugging commands:
+    * **A** - get raw ADC values,
+    * **w** - watchdog test;
+* **R** - reset;
+* **t** - get MCU temperature;
+* **V** - get VDD value.
+
+## Messages
+
+
+
+## Servos
+The board controls up to three servos like SG-90.
+Three timer's outputs used for this purpose. Timer frequency 50Hz, pulse width from 500 to 2400us.
+