Add: More readme texts

Chg: Reduce "travis.yml" to UNO (avr) only

.travis.yml

@@ -4,8 +4,6 @@ before_install:
   - source <(curl -SLs https://raw.githubusercontent.com/chatelao/travis-ci-arduino/master/install.sh)
 script:
   - build_platform uno
-  - build_platform leonardo
-  - build_platform esp8266
 notifications:
   email:
     on_success: change

README.md

@@ -1,4 +1,36 @@
 MiniPirate
 ==========
 
-Arduino Serial Command Tool
+A simple commandline to scan I2C, read/write GPIO, read/write EEPROM and read CPU informations from any Serial terminal. Ideal for exploring new devices without any code writing.
+
+List of supported commands:
+---------------------------
++ h/? - Show this help
++ p - Show all port values & directions
++ q - Show all port values & directions (quick)
++ < - Set a port as INPUT
++ > - Set a port as OUTPUT
++ / - Set a port to HIGH (clock up)
++ \ - Set a port to LOW (clock down)
++ ^ - Set a port LOW-HIGH-LOW (one clock)
++ $ - Do a pin sweep
++ c - Set port to clock high and low with given delay
++ g - Set analog (pwm) value
++ s - Set servo value
++ \A2/A3 - Set Pin A2 to low, Pin A3 to high (and both to output)
++ s 5 90 - Set Servo on Pin D5 to 90°
++ i 2 r 10 - Switch to I2C device 2 and read 10 bytes
++ i - Scan i2c device addresses
++ # - Set i2c device active x 
++ r # - Read i2c n bytes from active device
++ w # # # - Write i2c bytes to active device
++ x - save current config to eeprom
++ y - load last config from eeprom
++ z - set all ports to input and low
++ v - Show AVR VCC reading
++ t - Show AVR internal temperature reading
++ f - Show free memory
++ u - Show system uptime (or clock)
++ e - Erase EEPROM
++ * - Reboot
++