Add descriptive Readme

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+This is a small project to RDS data reception and decoding.
+Do not expect anything dramatically great or extremely usable :)
+
+decoder/
+       Code for decoding RDS and TMC data streams
+
+driver-n900/
+       Enhancement to the Nokia N900 FM radio driver to
+       actually output the raw RDS data in V4L compliant format
+       to the radio device (/dev/radio1) - kernel diff and
+       ready compiled kernel module (because it was nasty to get
+       the compile setup right - just for your convenience)
+