Add read me file.

README.md

@@ -5,8 +5,9 @@
 The 1u dual vca is 6hp in width, it has two channels each forming a row with a
 signal input, control voltage input, and signal output jack appearing from left
 to right on the front panel. Built around the [AS3360D][as3360] IC, the signal
-input accepts 20Vpp, the signal output is 10Vpp, depending on the resistors
-configuration each vca will become fully open according to the following table:
+input maximum is 20Vpp, the signal output maximum is 10Vpp, depending on the
+resistors configuration each vca will become fully open according to the
+following table:
 
 |     |        vca 1        |         vca 2         |
 |:---:|:-------------------:|:---------------------:|