Create readme.md

4x4/readme.md

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+More info here:
+
+http://www.40percent.club/2018/01/4x4x4x4x4.html
+
+[How to order PCBs from gerber files](http://www.40percent.club/2017/03/ordering-pcb.html)
+
+EasyEDA ordering info:
+
+PCB
+
+![4x4front](4x4front.png)
+![4x4back](4x4back.png)
+
+Gerber: 4x4.zip
+
+
+    76.2mm * 76.2mm
+    Layers: 2
+    PCB Thickness: 1.6mm
+    PCB Quantity: 10
+    PCB Color: Green
+    Surface Finish: HASL(with lead)
+    Copper Weight: 1oz.
+
+
+Files released under https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+![Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License](https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png)