Adds Adding of Games to the system.

gamenight-database/migrations/2025-06-27-171106_owned_games/down.sql

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+-- This file should undo anything in `up.sql`
+
+drop table owned_game;

gamenight-database/migrations/2025-06-27-171106_owned_games/up.sql

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+-- Your SQL goes here
+
+create table owned_game (
+    user_id UUID NOT NULL,
+    game_id UUID NOT NULL,
+    CONSTRAINT FK_gamenight_id FOREIGN KEY (user_id) REFERENCES client(id) ON DELETE CASCADE,
+    CONSTRAINT FK_user_id FOREIGN KEY (game_id) REFERENCES game(id) ON DELETE CASCADE,
+    PRIMARY KEY(user_id, game_id)
+)