Initial commit

- Sets up the onnxruntime environment, but doesn't load or run networks
   yet.

 - The things builds and run on Windows.

 - Still working on getting the Linux (arm64 for now) test to work.

onnx_example_application/onnx_example_application.go

@@ -0,0 +1,38 @@
+// This application loads a test ONNX network and executes it on some fixed
+// data. It serves as an example of how to use the onnxruntime wrapper library.
+package main
+
+import (
+	"fmt"
+	"github.com/yalue/onnxruntime"
+	"os"
+	"runtime"
+)
+
+func run() int {
+	if runtime.GOOS == "windows" {
+		onnxruntime.SetSharedLibraryPath("../test_data/onnxruntime.dll")
+	} else {
+		onnxruntime.SetSharedLibraryPath("../test_data/onnxruntime.so")
+	}
+	e := onnxruntime.InitializeEnvironment()
+	if e != nil {
+		fmt.Printf("Error initializing the onnxruntime environment: %s\n", e)
+		return 1
+	}
+	fmt.Printf("The onnxruntime environment initialized OK.\n")
+
+	// Ordinarily, it is probably fine to call this using defer, but we do it
+	// here just so we can print a status message after the cleanup completes.
+	e = onnxruntime.CleanupEnvironment()
+	if e != nil {
+		fmt.Printf("Error cleaning up the environment: %s\n", e)
+		return 1
+	}
+	fmt.Printf("The onnxruntime environment was cleaned up OK.\n")
+	return 0
+}
+
+func main() {
+	os.Exit(run())
+}