feat: 全量同步 254 个常用的 Arduino 扩展库文件

arduino-libs/arduino-cli/libraries/MD5_String/README.md

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+A simple MD5 library for the Arduino,
+
+Based on the work of scottmac. The original can be found at https://github.com/scottmac/arduino/blob/master/md5/md5.pde .
+
+### Usage
+
+// Hash a string and store the result in hash.
+String hash = md5("Hello World!");
+
+// Hash a buffer and store the result in hash.
+String hash = md5(buffer, bufferSize);
+