add example of protobuf rendering

README.md

@@ -871,7 +871,7 @@ Test it with:
 $ curl -v --form user=user --form password=password http://localhost:8080/login
 ```
 
-### XML, JSON and YAML rendering
+### XML, JSON, YAML and ProtoBuf rendering
 
 ```go
 func main() {
@@ -905,6 +905,18 @@ func main() {
 		c.YAML(http.StatusOK, gin.H{"message": "hey", "status": http.StatusOK})
 	})
 
+	r.GET("/someProtoBuf", func(c *gin.Context) {
+		reps := []int64{int64(1), int64(2)}
+		label := "test"
+
+		// Proto specifically defines the testdata/protoexample file
+		data := &protoexample.Test{
+			Label: &label,
+			Reps:  reps,
+		}
+		c.ProtoBuf(http.StatusOK, data)
+	})
+
 	// Listen and serve on 0.0.0.0:8080
 	r.Run(":8080")
 }