mark read backend

src/json_serialization/mod.rs

@@ -3,6 +3,7 @@ pub mod login;
 pub mod new_feed;
 pub mod new_feed_item;
 pub mod new_user;
+pub mod read_feed_item;
 pub mod readable;
 pub mod url;
 pub mod user;

src/json_serialization/read_feed_item.rs

@@ -0,0 +1,6 @@
+use serde_derive::Deserialize;
+
+#[derive(Deserialize)]
+pub struct ReadItem {
+    pub id: i32,
+}