Add link to cookbook example of basic auth (#752)

Jan Hrček · Jan Hrček · commit e9113111d611 · 2018-03-21T04:48:01.000+01:00
diff --git a/doc/tutorial/Authentication.lhs b/doc/tutorial/Authentication.lhs
@@ -409,6 +409,8 @@ As of `0.5`, *servant-client* comes with support for basic authentication!
 Endpoints protected by Basic Authentication will require a value of type
 `BasicAuthData` to complete the request.
 
+You can find more comprehensive Basic Authentication example in the [Cookbook](../cookbook/basic-auth/BasicAuth.html).
+
 ### Generalized Authentication
 
 Servant `0.5` also shipped with support for generalized authentication. Similar
