docs readme: update document

Signed-off-by: John Sanpe <[email protected]>

README.md

@@ -11,3 +11,53 @@ This program can easily download firmware to w800 series devices, as well as mod
 | [![build status](https://github.com/JohnSanpe/w80xprog/actions/workflows/macos.yml/badge.svg?branch=master)](https://github.com/JohnSanpe/w80xprog/actions/workflows/macos.yml?query=branch%3Amaster) | Build default config on Macos |
 | [![build status](https://github.com/JohnSanpe/w80xprog/actions/workflows/windows.yml/badge.svg?branch=master)](https://github.com/JohnSanpe/w80xprog/actions/workflows/windows.yml?query=branch%3Amaster) | Build default config on Windows |
 | [![build status](https://github.com/JohnSanpe/w80xprog/actions/workflows/codeql.yml/badge.svg?branch=master)](https://github.com/JohnSanpe/w80xprog/actions/workflows/codeql.yml?query=branch%3Amaster) | Code analyse on codeql |
+
+## Usage
+
+```
+$ ./build/w80xprog
+w80xprog v1.2
+Copyright(c) 2021-2024 John Sanpe <[email protected]>
+License GPLv2+: GNU GPL version 2 or later.
+
+Usage: w80xprog [options]...
+        -h, --help                display this message
+        -p, --port <device>       set device path
+        -s, --speed <freq>        set link baudrate
+        -n, --nspeed <freq>       set new baudrate
+        -o, --secboot             entry secboot mode
+        -i, --info                read the chip info
+        -f, --flash <file>        flash chip with data from filename
+        -e, --erase <offset:size> erase the specific flash
+        -b, --bt <mac>            set bluetooth mac address
+        -w, --wifi <mac>          set wifi mac address
+        -g, --gain <gain>         set power amplifier gain
+        -r, --reset               reset chip after operate
+```
+
+### Flash chip
+
+```
+$ ./build/w80xprog -p /dev/ttyUSB0 -n 921600 -orf ./flash.bin
+w80xprog v1.2
+Copyright(c) 2021-2024 John Sanpe <[email protected]>
+License GPLv2+: GNU GPL version 2 or later.
+
+Entry secboot:
+        Version: Secboot V0.6
+Setting speed:
+        [0x06]: OK
+Chip Flash:
+100% [================================================] 30.902 KB, 9.639 KB/s
+Chip reset...
+```
+
+## Build form source
+
+```
+$ git clone https://github.com/JohnSanpe/w80xprog.git
+$ cd w80xprog
+$ git submodule update --init --recursive
+$ cmake -Bbuild
+$ cmake --build build
+```