Added README.md

README.md

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+Refer for more info:
+https://www.multiboard.io/
+
+
+Or at thangs.com
+https://thangs.com/designer/Keep%20Making/3d-model/8x8%20Multiboard%20Core%20Tile-974214
+
+Usage:
+```
+// Create a common (core) tile 3 cells width, and 2 cells in height
+multiboard_common(3, 2);
+
+// Create a side tile tile 3 cells width, and 2 cells in height. Tooth are on
+// the right side
+multiboard_side(3, 2);
+
+// Create a corner 3 by 2 tile
+multiboard_side(3, 2);
+```
+
+If you use it, you'll please me if you let me know.