Modify Readme

Remove unnecessary part and add build instructions

Author: pablosun

README.md

@@ -5,13 +5,6 @@ There is a Arduino IDE board support package for LinkIt Smart 7688 (Arduino Comp
 ## ENVIRONMENT
 The board support package works with Arduino IDE 1.6.4.
 
-## Installation via Zip Package
- - Unzip the zip archive `board_support.zip` to `{ARDUINO_SKETCHBOOK_LOCATION}/hardware/...
- - If there is no `hardware` folder please create it manually
- - The resulting path should be like this: `{ARDUINO_SKETCHBOOK_LOCATION}/hardware/mtk/avr/boards.txt`
- - Restart Arduino IDE
- - Then a "LinkIt Smart 7688 Duo" option should appear under Arduino IDE's Board sub-menu
-
 ## Installation via Board Manager
 {refer to http://pablo-sun.github.io/}
 
@@ -29,25 +22,15 @@ It should work without the need to install a driver and mounted as {need confirm
 ### OS X
 It should work without the need to install a driver and mounted as a serial device under `/dev/tty.usbmodem1413`. The number `1413` can be different on each OS X machine.
 
-## Using LinkIt Smart 7688 Duo as an ATMega32U4 Boot Loader Programmer
-
-Sometimes you need to re-program the boot loader of the ATMega32U4 on LinkIt Smart 7688 Duo. You can use LinkIt Smart 7688 Duo as a ATMega boot loader programmer to program the bootloader of the ATMega32U4 on another LinkIt Smart 7688 Duo.
-
-To do this, suppose we have 2 LinkIt Smart 7688 Duo boards. The first board _A_ act as the programmer to program the second board _B_.
-
-1. Select `Tools > Board > LinkIt Smart 7688 Duo`
-2. Open sketch `Example > ArduinoISP` 
-3. Modify the line `#define RESET     SS` to `#define RESET     10`
-4. Upload the modified sketch to board _A_
-5. Connect pin `S0`, `S1`, `S2`, `GND` of board _A_ to the same pin of board _B_
-6. Connect pin `D10` of board _A_ to pin `RST` of board _B_
-7. Select `Tools > Programmer > LinkIt Smart 7688 Duo as ISP`
-8. Select `Tools > Burn Bootloader`
+### How to Build the Release Package
+At this moment building the release pakcages requires:
+ - Windows
+ - 7-zip
+ - Python 2.7 with `requests` package installed
+ - Internet connection
 
+To build the release package
+ - edit [`gen_repo.bat`](gen_repo.bat) and modify the version number
+ - then execute `gen_repo.bat`
 
-(This one is still verifying)
-1. Upload sketch `Example > ArduinoISP` to board _A_
-2. Connect pin `S0`, `S1`, `S2`, `GND` of board _A_ to the same pin of board _B_
-3. Connect pin `S3` of board _A_ to pin `RST` of board _B_
-4. Select `Tools > Programmer > LinkIt Smart 7688 Duo as ISP`
-5. Select `Tools > Burn Bootloader`
+The build script will zip the `avr` supporting package and create a JSON description file, merging current JSON repository file from `download.labs.mediatek.com`.