Update README.md

fix exe

fix executable

Update README.md

Adding executable

Adding add_member_group function and route

Adding add_group route and function

Adding group_by_member route and function

Adding group_by_id and group_by_leader

Init group controller & adding group_all

Adding the add_meal route and function

Fixing the user_by_name function

Adding the user_by_name and user_by_member

Fixing the meal_by_group function

Adding the meal_by_id and meal_by_group