Readme update

readme.md

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 ESP8266 + CC1101 Davis weather station wifi logger
 --------------------------------------------------
+
+The intention is to gather data from a Weather station made by Davis.
+In this case a Vantage Vue (integrated all sensors in one package) and
+push them directly to an InfluxDB instance via WiFi.
+
+Prerequisites:
+==============
+- WiFi available, plus access to it. (WPA2 PSK preferred)
+- Running INfluxDB instance on the same network
+- ESP8266 microcontroller (NodeMCU 8266 preferred)
+- CC1101 from Texas Instruments radio chip, the 868 MHz version! There are 433Mhz sold out there, read descriptions
+- a couple wires
+- 5V / 3.3V source, depending on what version of ESP you get. A stable 3.3V is preferred
+
+Quick setup of HW:
+==================
+1, Interconnect these pins:
+