update quad/ readme

quad/README.md

@@ -77,7 +77,7 @@ make test
 
 And glad to hear you are interested in writing your own unit tests! Look at the
 [README](/Unity/README.md) and examples in the Unity testing library at
-[`Unity/`](/Unity/).
+[`Unity/`](/Unity/). A few notes about using Unity are [here](doc/Unity_notes.md).
 
 #### Manually testing the hardware interface
 
@@ -97,4 +97,5 @@ Ideally, you would run these tests from the XSDK IDE.
 ## Other Documents
 * [Hardware Block Diagram](doc/images/FPGA_Diagram.png)
 * [Zybo Pinout Assignments](doc/zybo_pinout_assignments.md)  
-* [How to use Xilinx software tools](doc/how_to_use_XSDK.md)  
+* [How to use Xilinx software tools](doc/how_to_use_XSDK.md)
+* [Unity notes](doc/Unity_notes.md)