Create README.md

README.md

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+# boxpacker3
+
+A 3D bin packing library in golang.
+
+### Usage
+
+```golang
+packer := boxpacker3.NewPacker()
+
+boxes := []*boxpacker3.Box{
+  boxpacker3.NewBox("box std", 530, 380, 265, 20000),
+}
+items := []*boxpacker3.Item{
+  boxpacker3.NewItem("product 1", 100, 100, 5, 2690),
+  boxpacker3.NewItem("product 2", 100, 5, 100, 2690),
+  boxpacker3.NewItem("product 3", 5, 100, 100, 2690),
+}
+
+packResult := packer.Pack(boxes, items)
+fmt.Println(packResult.Boxes) // boxes and items
+fmt.Println(packResult.UnfitItems) // Items that didn't fit in boxes
+```
+
+---
+Supported by
+
+[![Supported by JetBrains](https://cdn.rawgit.com/bavix/development-through/46475b4b/jetbrains.svg)](https://www.jetbrains.com/)