readme for new housing

experiment/production/housing/v-amaranth/README.md

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+Popufare Driver Interface Unit Housing, Version: `Amananth`
+===
+
+###### 2020-02-27
+
+![housing preview](img/v-amaranth.png)
+
+This is version 'amaranth' of the Driver Interface Unit (DIU) housing.
+
+* Attaches to legacy DIU mounting bracket
+* 7 inch capacative display
+* Increased height to accomodate larger display
+* added bracketing for buck converter on top back
+* added bracketing for screw terminal on top back
+* added power connector to side
+* added max232 connector to side