add routers themes

themes/manager.go

@@ -1,4 +1,4 @@
-package theme // Declare the package at the top
+package themes // Declare the package at the top
 import (
 	"fmt"
 	"html/template"
@@ -52,3 +52,6 @@ func (tm *ThemeManager) LoadTheme(themeName string) error {
 
 	return nil
 }
+func NewManager() *ThemeManager {
+	return &ThemeManager{}
+}