Some work on interfaces

I'm not happy. It kinda sucks right now. I hope I can fix it~~~~~

But for now I must move to my laptop

atproto/src/lib.rs

@@ -1,17 +1,37 @@
 use lazy_regex::regex_captures;
 use core::str::FromStr;
+use std::fmt::{
+  Display, Formatter, Result as FmtResult
+};
 
 pub use atrium_api::types::{
   Collection,
   string::{
+    AtIdentifier as Authority,
+    Datetime,
+    Did,
     Nsid,
     RecordKey,
-    AtIdentifier as Authority,
+    Tid,
+    Handle,
   }
 };
 
 pub mod lexicons;
 
+pub struct Cid(String);
+
+impl Display for Cid {
+    fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
+        write!(f, "{}", self.0)
+    }
+}
+
+pub struct StrongRef<T> {
+  pub content: T,
+  pub cid: Cid,
+}
+
 pub struct Uri {
   whole: String,
   // These fields could be useful in the future,