Update of README.md

README.md

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-# arduino-lueftersteuerung
+Arduino humidity fan control
+============================
+
+This Sketch is used to control an Arduino Nano which is used to get the wet air out of a basement. It'll 
+- read two DHT22 sensors to get the temperature and humidity from the inside and outside world
+- calculate the absolute humidity
+- decide, if it is useful to blow the air out
+- use a relais to switch on or off a fan
+- display data on a 20x4 I2C-LCD
+- log the measurements to an SD card, using a RTC module for timestamping
+
+Bugs
+----
+
+- the sketch crashes after a random (hours .. days) time due to unknown reason