implemented /help route

src/models/help.ts

@@ -0,0 +1,16 @@
+import db from '../db';
+import mongoose from 'mongoose';
+
+const HelpSchema = new mongoose.Schema({
+  key: {type: String, index: {unique: true}},
+  level: String,
+  text: String
+}, {minimize: false});
+
+// changelog query helper
+HelpSchema.query.log = function <Q extends mongoose.DocumentQuery<any, any>> (req) {
+  db.log(req, this);
+  return this;
+}
+
+export default mongoose.model<any, mongoose.Model<any, any>>('help', HelpSchema);