Add framework core type

framework/core.go

@@ -0,0 +1,18 @@
+package framework
+
+import (
+	"net/http"
+)
+
+// Core is the core struct of the framework
+type Core struct{}
+
+// NewCore initialize the Core.
+func NewCore() *Core {
+	return &Core{}
+}
+
+// ServeHTTP implements the Handler interface
+func (c *Core) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	// TODO
+}