Add lots of things

drill-and-practice/services/questionService.js

@@ -0,0 +1,8 @@
+import { sql } from "../database/database.js";
+
+const countQuestions = async () => {
+  const result = await sql`SELECT COUNT(id) FROM questions`;
+  return result.rows[0].count;
+};
+
+const getQuestionsByTopicId = async (topicId) => {