Add a little readme

README.md

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+# øko Weather Station
+
+## Features
+
+* No external power source needed (solar powered)
+* Very low cost (~20 EUR)
+* Data will be pushed into InfluxDB over WiFi
+* Energy saving features and DeepSleep
+* Easy to build with of the shelf hardware
+
+## Data gathered
+
+* Temperature (Calsius, very accurate with the BME230 sensor from Bosch)
+* Pressure (hPa)
+* Humidity (%H)
+* Light (lumen)
+* Wind speed (km/h)
+* Battery voltage (V)
+
+## Hardware
 ![schema](/doc/schema.png)
+
+## Visualiation
+![grafana](/doc/grafana.png)