added camp plan tables

src/main/resources/tables/slot.sql

@@ -0,0 +1,8 @@
+create table public.t_slot (
+  created timestamp default CURRENT_TIMESTAMP,
+  pk_slot int primary key generated always as identity,
+  name text,
+  fk_plan int not null references public.t_plan(pk_plan),
+  start_time time not null,
+  end_time time not null
+);