Added basic exercise addition and deletion

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  db:
+    image: postgres:17
+    volumes:
+      - ./.data:/var/lib/postgresql/data
+    ports:
+      - 5432:5432
+    environment:
+      POSTGRES_PASSWORD: "password"
+      POSTGRES_USER: "postgres"
+      POSTGRES_DB: "postgres"
+