feat: add sample endpoint to test JWT

src/services/userService.ts

@@ -75,6 +75,16 @@ export class UserService {
 
 	}
 
+	/**
+	 * Finds a User by it's identifier.
+	 *
+	 * @param      {number}                id      The identifier
+	 * @return     {(Promise<User|null>)}  User (or null if not found)
+	 */
+	async findById(id: number): Promise<User | null> {
+		return await this.userRepo.findOneBy({id});
+	}
+
 	/**
 	 * Counts all the user entities in DB.
 	 * Used to tell whether the next created account should be an admin