Add linting

Author: nicolelim02

backend/question-service/.prettierignore

@@ -0,0 +1 @@
+node_modules

backend/question-service/.prettierrc

@@ -0,0 +1 @@
+{}

backend/question-service/eslint.config.mjs

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+import globals from "globals";
+import pluginJs from "@eslint/js";
+
+export default [
+  { files: ["**/*.js"], languageOptions: { sourceType: "commonjs" } },
+  { languageOptions: { globals: globals.node } },
+  pluginJs.configs.recommended,
+];