update README

README.md

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+[中文版](README_CN.md)
 
+# Sample APK: Bluetooth Transmission of HEX to BLE-UNO
+
+## Steps
+
+- The host connects to the BLE-UNO service UUID `0000ffe0-0000-1000-8000-00805f9b34fb` in Bluetooth BLE mode, with the device Bluetooth name defaulting to `ble-uno4.2`. The UUID for the serial port character is `0000ffe1-0000-1000-8000-00805f9b34fb`, and the UUID for the AT command character is `0000ffe2-0000-1000-8000-00805f9b34fb`.
+
+- Write `AT+TARGE_RESET\r\n` to `0000ffe2-0000-1000-8000-00805f9b34fb` to reset the BLE-UNO.
+
+- Write the bin file converted from hex according to the skt500v1 protocol to `0000ffe1-0000-1000-8000-00805f9b34fb`.

README_CN.md

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+# 示例APK：蓝牙传输HEX到BLE-UNO
+
+## 步骤
+
+- 主机通过蓝牙BLE模式连接到BLE-UNO的服务UUID: `0000ffe0-0000-1000-8000-00805f9b34fb`,设备蓝牙名字默认为`ble-uno4.2`, 其中串口的字符UUID为`0000ffe1-0000-1000-8000-00805f9b34fb`,AT指令的字符UUID为`0000ffe2-0000-1000-8000-00805f9b34fb`
+
+- 往`0000ffe2-0000-1000-8000-00805f9b34fb`写入`AT+TARGE_RESET\r\n`重置BLE-UNO
+
+- 往`0000ffe1-0000-1000-8000-00805f9b34fb`写入按照skt500v1协议写入hex转成的bin文件