Add get users rest endpoint
diff --git a/core/kg/common/interfaces.go b/core/kg/common/interfaces.go
index 2c20e28..4966c13 100644
--- a/core/kg/common/interfaces.go
+++ b/core/kg/common/interfaces.go
@@ -15,4 +15,5 @@
 type AppIface interface {
 	GetUser(userID string) (*model.User, error)
 	CreateUser(user *model.User) (*model.User, error)
+	GetUsers(page, perPage int) ([]*model.User, error)
 }