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Readme.md

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+# Introduction
+
+This repository guides you to implement and use the HTU21D temperature and humidity sensor by using I2C communication.
+
+This repository contains the following files:
+
+- `htu21d.h` library header file
+- `htu21d.c` implementation methods file
+- `main.c` example to test library
+- `example` output compiled file to test readings
+
+This library requires `libi2c-dev` to be installed on your raspberry