Hardware File Updates

o Added CAD files to Hardware folder
o Renamed schematic diagram file

Hardware/Transmitter CAD Files/readme.txt

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+files in this zip are:
+
+1. readme.txt  this file.
+2. case_lid.stl the lid for the transmitter case.
+3. bottom_half.stl the bottom main part of the case.
+4. 80mbase.stl the sub chaassis that the PCB mounts on. Glue inside case.
+5. audio_jack_holder.stl  a bracket to hold optional audio jack for tone outputs.
+6. 9vbattery_adaptor.stl a test adaptor for testbench testing with a powersupply.
+
+All units are mm