Added README and some assets for the README.

README.md

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+# Interface a C64 with an Arduino using Firmata.
+
+This is a Firmata client implementation for the C64 using the userport at 2400 baud for communications.
+
+![C64 Firmata](./assets/C64_Firmata.png)
+
+## Prerequisites
+
+You'll need:
+
+  * x64
+  * Arduino UNO
+  * Grove shield, servo, button, LED, potmeter, relay
+
+Optional:
+
+  * DIY for the Grove stuff
+  * A real C64
+  * A way to transfer the program to the C64
+  * Userport connector
+  * Wires between the C64 and the Arduino UNO
+
+## Configure x64
+
+Plug in the Arduino, note down the device name of the Arduino (/dev/...).
+Start x64 and go to the RS232 settings. Set baudrate to 2400 and device to the correct name.
+
+## Using a real C64
+
+```
+USER PORT     ARDUINO
+ N              GND
+ M              RX(1)
+ B,C            TX(0)
+
+```
+
+Power up the Arduino using a USB power plug or a power adapter.
+
+
+## What's supported
+
+  * INPUT
+  * OUPUT
+  * ANALOG
+  * PWM
+  * SERVO
+
+## Demo on a real C64
+
+
+![C64 Firmata demo](./assets/C64_Firamata_movie.gif)
+
+
+## Copyright
+
+(c) 2019 Johan Van den Brande
+
+```
+  (\/)
+ ( ..)
+C(")(")
+```