Added README

README.md

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+# Fastclock Client
+## Model Railroad Fastclock Client
+
+### Hardware Prerequisites
+- ESP8266 or ESP32, e.g. Wemos Mini D1
+- OLED Display 64x48 (Wemos shield)
+- Battery (LiIon) support
+
+### Software Prerequisites
+- Uses the ssd1306dj library, which is derived from Adafruit to support 64x48 resolution
+- Fastclock Server (WLAN/Network based)
+- Mongoose installed (being able to start "mos" on the command line)
+
+### Howto flash
+Standard procedure, as with any other App. 
+- git clone this repo
+- git clone the ssd1306dj library, use following file structure
+  - .../libs/ssd1306dj/...
+  - .../fastclockClient/...
+  - .../fastclockServer/...
+- build locally: mos build --local && mos flash
+