Add app settings model, routes, db ops, service, use settings for issueToken

Server/db/mongo/modules/settingsModule.js

@@ -0,0 +1,17 @@
+const AppSettings = require("../../../models/AppSettings");
+const SERVICE_NAME = "SettingsModule";
+
+const getAppSettings = async () => {
+  try {
+    const settings = AppSettings.findOne();
+    return settings;
+  } catch (error) {
+    error.service = SERVICE_NAME;
+    error.method = "getSettings";
+    throw error;
+  }
+};
+
+module.exports = {
+  getAppSettings,
+};