Add read me file.

.gitignore

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 .DS_Store
 *.b#*
 *.s#*
+*.amdn

README.md

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+# 1u dual vca
+
+![1u dual vca](/1u dual vca panel.png "1u dual vca")
+
+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 maximum is 20Vpp, the signal output maximum is 10Vpp, depending on the
+resistor configuration each vca will become fully open according to the
+following table:
+
+|     |        vca 1        |         vca 2         |
+|:---:|:-------------------:|:---------------------:|
+|  5V |  R7 = 30k, R8 = 24k |  R12 = 30k, R11 = 24k |
+|  8V | R7 = 100k, R8 = 47k | R12 = 100k, R11 = 47k |
+| 10V |  R7 = 47k, R8 = 47k |  R12 = 47k, R11 = 47k |
+
+[as3360]: http://www.alfarzpp.lv/eng/sc/AS3360.pdf