Update README.md

README.md

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 MindMirrorEeg
 =============
 
-Portable 2 channel EEG with Cade/Blundell bandpass filters
+Portable 2 channel EEG with Cade/Blundell bandpass filters.
+<br>Designed to run on an Intel 80C196 single chip device in 1992.
+
+<b>The challanges</b>
+<br>1) implementing the digital band pass filters 
+and getting them to run on a processor not designed for Digital Signal Processing.
+<br>2) Keeping the power manageable to use replaceable batteries
+<br>3) Using an LCD module to provide visual information of the output of 14 channels.
+<br>4) Communicating safely with a windows PC to show the details on a low cost PC display (circa 1992) 
+