docs: add versioned docs (#1)

website/versioned_docs/version-2.6/extras/middlewares.md

@@ -0,0 +1,13 @@
+---
+id: middlewares
+title: Middlewares
+sidebar_label: Middlewares
+slug: /extras/middlewares
+---
+
+`nestjs-telegraf` has support of the Telegraf middleware packages. To use an existing middleware package, simply import it and add it to the middlewares array:
+```typescript
+TelegrafModule.forRoot({
+  middlewares: [session()],  
+}),
+```