Add examples

examples/config/file/config.json

@@ -0,0 +1,12 @@
+{
+    "hosts": {
+        "database": {
+            "address": "10.0.0.1",
+            "port": 3306
+        },
+        "cache": {
+            "address": "10.0.0.2",
+            "port": 6379
+        }
+    }
+}

examples/config/file/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/micro/go-micro/v2/config"
+	"github.com/micro/go-micro/v2/config/source/file"
+)
+
+func main() {
+	// load the config from a file source
+	if err := config.Load(file.NewSource(
+		file.WithPath("./config.json"),
+	)); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	// define our own host type
+	type Host struct {
+		Address string `json:"address"`
+		Port    int    `json:"port"`
+	}
+
+	var host Host
+
+	// read a database host
+	if err := config.Get("hosts", "database").Scan(&host); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(host.Address, host.Port)
+}