feat: 全量同步 254 个常用的 Arduino 扩展库文件

arduino-libs/arduino-cli/libraries/DFRobot_SHT20/README.md

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+# DFRobot_SHT20 Library for Arduino
+Provides an Arduino library for SHT20 Humidity And Temperature Sensor
+## Table of Contents
+
+* [Summary](#summary)
+* [Methods](#methods)
+* [History](#history)
+* [Credits](#credits)
+<snippet>
+<content>
+
+## Summary
+
+The library is used to Use the SHT20 Sensor to obtain humidity and temperature.
+
+## Methods
+
+```C++
+
+/*
+ * @brief Init SHT20 Sensor
+ */
+void initSHT20(void);
+
+/*
+ * @brief Check SHT20 Sensor
+ */
+void checkSHT20(void);
+
+/*
+ * @brief Read humidity
+ *
+ * @return The value of humidity
+ */
+float readHumidity(void);
+
+/*
+ * @breif Read Temperature
+ *
+ * @return The value of temperature
+ */
+float readTemperature(void);
+
+```
+
+## History
+
+- data 2017-9-12
+- version V1.0
+
+## Credits
+
+- author [Zhangjiawei  <jiawei.zhang@dfrobot.com>]