Integrate cobra into the framework part1

framework/contract/kernel.go

@@ -0,0 +1,10 @@
+package contract
+
+import "net/http"
+
+const KernelName = "goweb:kernel"
+
+type Kernel interface {
+	// HttpEngine we use actually gin.Engine, but it is open to change.
+	HttpEngine() http.Handler
+}