Added README

Author: grillbaer

README.md

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+# python-tsic
+
+Receive temperature readings from TSIC 206/306 chips connected to Raspberry Pi GPIO.
+The module `tsic.py` requires Python 3 and the great library `pigpio` for GPIO access with precise timing.
+
+It provides three major classes:
+* `TsicInputChannel` receive temperature measurements
+* `Measurement` a temperature measurement
+* `ZacWireInputChannel` received byte packets over ZACWire protocol (low-level handler for TsicInputChannel)
+
+See `example.py` for API usage or start `tsic.py <gpio-bcm> [--loop]` to read temperatures from a GPIO pin (Broadcom numbering).