rework readme file

README.md

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+# General
+
+rkdeveloptool gives you a simple way to read/write rockusb device
+
+## Compile and install
+
+1) Install *libusb* and *libudev*
+```
+sudo apt-get install libudev-dev libusb-1.0-0-dev dh-autoreconf
+```
+2) Download rkdeveloptool
+```
+git clone https://github.com/rockchip-linux/rkdeveloptool.git
+```
+3) Go into root of rkdeveloptool
+```
+cd rkdeveloptool
+```
+4) Generate *aclocal.m4*
+```
+aclocal
+```
+5) Update the GNU Autotools build system
+```
+autoreconf -i
+```
+6) Generate *config.h.in* file
+```
+autoheader
+```
+7) Add missing auxiliary files
+```
+automake --add-missing
+```
+8) Prepare the project for compilation
+```
+./configure
+```
+9) Invoke the build process
+```
+make
+```
+
+## Usage
+
+To see the help information and available options for the rkdeveloptool command input
+```
+rkdeveloptool -h
+```
+
+## Example:
+
+### Download kernel.img
+
+```
+sudo ./rkdeveloptool db RKXXLoader.bin    //download usbplug to device
+sudo ./rkdeveloptool wl 0x8000 kernel.img //0x8000 is base of kernel partition,unit is sector.
+sudo ./rkdeveloptool rd                   //reset device
+```
+
+## Compile error help
+
+If you encounter the error like below:
+
+./configure: line 4269: syntax error near unexpected token `LIBUSB1,libusb-1.0'
+
+./configure: line 4269: `PKG_CHECK_MODULES(LIBUSB1,libusb-1.0)'
+
+You should install *pkg-config* and *libusb-1.0*:
+```
+sudo apt-get install pkg-config libusb-1.0 
+```
+
+