Add Ivan's license

LICENSE

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+License from Ivan's instructions:
+Everything that is in these files that I produced myself, 
+apart from reselling the files, is allowed. You can print 
+and sell parts, sell machines, sell courses to build the 
+machine. Modify the parts and post them for free, as long 
+as you don’t sell the files and keep this license on everything 
+you make with the files and credit me, we’re good. No DRM or 
+anything, you are even allowed to repost the files as long as 
+they’re kept free. Why buy this then? To support me and keep 
+me encouraged to do more projects like this.
+
+Link to buy files:
+https://ivanmiranda.com/products/3d-printed-cnc