init backend, added admin page in front

Signed-off-by: Nicolas Froger <nicolas@kektus.xyz>

summer2024-backend/src/main/resources/db/migration/V1.0.0__Init.sql

@@ -0,0 +1,15 @@
+create table Post (
+    id bigserial not null primary key,
+    description text,
+    date timestamp(6) with time zone,
+    city varchar(64),
+    country varchar(64),
+    latitude float4,
+    longitude float4
+);
+
+create table Asset (
+    id bigserial not null primary key,
+    filename varchar(255) not null,
+    post_id bigint references Post
+);