Added first Readme.md file

README.md

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+# OpenDTU
+
+## Background
+This project was started from [this](https://www.mikrocontroller.net/topic/525778) discussion (Mikrocontroller.net).
+It was the goal to replace the original Hoymiles DTU (Telemetry Gateway) with their cloud access. With a lot of reverse engineering the Hoymiles protocol was decrypted and analyzed.
+
+
+## Features for end users
+* Uses ESP32 mikrocontroller and NRF24L01+
+* Multi-Inverter support
+* MQTT support
+* Nice and fancy WebApp with visualisation of current data
+
+## Features for developers
+* The mikrocontroller part
+    * Build with Arduino PlatformIO Framework for the ESP32
+    * Uses [ESPAsyncWebserver](https://github.com/me-no-dev/ESPAsyncWebServer) and [Async MQTT client](https://github.com/marvinroger/async-mqtt-client)
+
+* The WebApp part
+    * Build with [Vue.js](https://vuejs.org)
+
+## Building
+* Building the WebApp
+    * The WebApp can be build using yarn
+    ```
+    $ yarn install
+    $ yarn build
+    ```
+    * The updated output is placed in the 'data' directory
+
+* Building the mikrocontroller firmware
+    * Visual Studio Code with the PlatformIO Extension is required for building