Attempt to format readme

README.md

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 # MX5-Arduino-Speed
 
-Target Hardware:
+##Target Hardware
+
 Arduino ATMega328p
+
 2.42 Inch SS1309 128x64 Monocrhome OLED
+
 5v Beeper
+
 5v Speed sensor (#DSSA from www.carbuildersolutions.com)
 
-Pinout:
+##Pinout
+
 OLED_MOSI   9
+
 OLED_CLK   10
+
 OLED_DC    11
+
 OLED_CS    12
+
 OLED_RESET 13
+
 Beeper 2 (and to GND)
+
 Speed sesor 4 (and 5v, GND)
 
-Configuration via USB, 115200. Commands are:
+##Configuration commands (via USB Serial 115200)
 
 ODO - Press return and then enter new odometer reading
+
 PPM - Press return and enter pulses per half mile (use CAL mode in preference)
+
 CAL - Enter calibration mode (see below)
+
 RUN - Exit calibration mode
 
-Calibration mode:
+##Calibration mode
 
 In calibration mode it starts counting pulses immediately. Calibration should be done over a measured half a mile. Press enter when starting the half mile, and again at the end. The number of pulses will be displayed on the screen. To write this to EEPROM and return to normal mode type 'RUN'. If the data is not suitable (missed marker etc) then just repeat the measurement.