Add 'tetrominoes/readme.md'

tetrominoes/readme.md

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+More info here:
+
+http://www.40percent.club/2019/12/tetrominoes.html
+
+[How to order PCBs from gerber files](http://www.40percent.club/2017/03/ordering-pcb.html)
+
+EasyEDA ordering info:
+
+Cube
+
+![cube](cube.png)
+
+Gerber: Gerber_Cube.zip
+
+    38mm Max* 38mm Max;
+    Layers: 2;
+    PCB Thickness: 1.6mm;
+    PCB Qty.: 10;
+    PCB Color: Green;
+    Surface Finish: HASL;
+    Copper Weight: 1;
+    Panelized PCBs: 1
+
+L
+
+![L](L.png)
+
+Gerber: Gerber_L.zip
+
+    57mm Max* 38mm Max;
+    Layers: 2;
+    PCB Thickness: 1.6mm;
+    PCB Qty.: 10;
+    PCB Color: Green;
+    Surface Finish: HASL;
+    Copper Weight: 1;
+    Panelized PCBs: 1
+
+S
+
+![S](S.png)
+
+Gerber: Gerber_S.zip
+
+    57mm Max* 38mm Max;
+    Layers: 2;
+    PCB Thickness: 1.6mm;
+    PCB Qty.: 10;
+    PCB Color: Green;
+    Surface Finish: HASL;
+    Copper Weight: 1;
+    Panelized PCBs: 1
+
+T
+
+![T](T.png)
+
+Gerber: Gerber_T.zip
+
+    38mm Max* 57mm Max;
+    Layers: 2;
+    PCB Thickness: 1.6mm;
+    PCB Qty.: 10;
+    PCB Color: Green;
+    Surface Finish: HASL;
+    Copper Weight: 1;
+    Panelized PCBs: 1
+
+Stick
+
+![Stick](Stick.png)
+
+Gerber: Gerber_Stick.zip
+
+    76mm Max* 19mm Max;
+    Layers: 2;
+    PCB Thickness: 1.6mm;
+    PCB Qty.: 10;
+    PCB Color: Green;
+    Surface Finish: HASL;
+    Copper Weight: 1;
+    Panelized PCBs: 1
+	
+	
+Gerber files released under https://creativecommons.org/licenses/by-sa/4.0/
+
+![Creative Commons Attribution-ShareAlike 4.0 International License](https://i.creativecommons.org/l/by-sa/4.0/88x31.png)