feat: add docker-compose config and create initial postgres schema

.gitignore

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+# Dependencies
+node_modules/
+
+# IDE / System files
+.DS_Store

docker-compose.yml

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+services:
+  postgres:
+    image: postgres:16-alpine
+    container_name: learning_platform_db
+    environment:
+      POSTGRES_USER: dev_user
+      POSTGRES_PASSWORD: "c21d8e935a40ed83"
+      POSTGRES_DB: learning_platform
+    ports:
+      - "5433:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+  pgadmin:
+    image: dpage/pgadmin4
+    container_name: learning_platform_pgadmin
+    environment:
+      PGADMIN_DEFAULT_EMAIL: ameerkhorsand@proton.me
+      PGADMIN_DEFAULT_PASSWORD: "2f204a6a606e8475"
+    ports:
+      - "5050:80"
+    depends_on:
+      - postgres
+
+volumes:
+  pgdata: