example: gRPC-compatible controller

as requested at: https://github.com/kataras/iris/issues/1449


Former-commit-id: a0af1a78bcfef85f297c5087c8cbb00124226036

_examples/mvc/grpc-compatible/main_test.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/kataras/iris/v12/httptest"
+)
+
+func TestBindContextContext(t *testing.T) {
+	app := newApp()
+
+	e := httptest.New(t, app)
+	e.POST("/login").WithJSON(map[string]string{"username": "makis"}).Expect().
+		Status(httptest.StatusOK).
+		JSON().Equal(map[string]string{"message": "makis logged"})
+}