Added documentation for Activity Flags

src/models/activity_data/activity_flag.rs

@@ -1,5 +1,6 @@
 use serde::Serialize;
 
+/// List of Activity Flags to send to Discord Client.
 #[derive(Serialize, Debug)]
 pub enum ActivityFlag {
     Instance = 1,

src/models/mod.rs

@@ -1,3 +1,4 @@
 pub mod activity;
 pub mod activity_data;
 pub mod client;
+pub mod error;