add cmd example

Author: InkSha

cmd/go-example.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+)
+
+func main() {
+	dir, err := os.Getwd()
+	if err != nil {
+		log.Fatalf("get working directory failed: %v", err)
+	}
+
+	fmt.Println("current working directory: ", dir)
+}