add gltf decoding example

README.md

@@ -14,6 +14,7 @@ The Go-Draco package supports the latest releases of Draco (v1.4.1) on Linux, ma
 - Mesh decoding
 - Mesh inspection
 - Pre-compiled static libraries for windows and linux
+- gltf extension for `github.com/qmuntal/gltf`
 
 ## Usage
 
@@ -41,6 +42,27 @@ func main() {
 }
 ```
 
+### glTF decoding
+
+```go
+package main
+
+import (
+  "fmt"
+  "github.com/qmuntal/gltf"
+  "github.com/qmuntal/draco-go/gltf/draco"
+)
+
+func main() {
+  doc, _err_ := gltf.Open("testdata/box/Box.gltf")
+  pd, _ := draco.UnmarshalMesh(doc, doc.BufferViews[0])
+  p := doc.Meshes[0].Primitives[0]
+  fmt.Println(pd.ReadIndices(nil))
+  fmt.Println(pd.ReadAttr(p, "POSITION", nil))
+  fmt.Println(pd.ReadAttr(p, "NORMAL", nil))
+}
+```
+
 ## Development
 
 The CGO bindings uses a C API that is maintained in [qmuntal/draco-c](https://github.com/qmuntal/draco-c), as the Draco team do not have enough bandwidth to support it. See [google/draco#467](https://github.com/google/draco/pull/663#issuecomment-772802508) for more context.