add a simple CLI

src/replica.rs

@@ -6,7 +6,7 @@ use std::collections::HashMap;
 use uuid::Uuid;
 
 /// A replica represents an instance of a user's task data.
-struct Replica {
+pub struct Replica {
     taskdb: Box<DB>,
 }
 
@@ -46,6 +46,11 @@ impl Replica {
         })
     }
 
+    /// Get all tasks as an iterator of (&Uuid, &HashMap)
+    pub fn all_tasks(&self) -> impl Iterator<Item = (&Uuid, &HashMap<String, String>)> {
+        self.taskdb.tasks().iter()
+    }
+
     /// Get an existing task by its UUID
     pub fn get_task(&self, uuid: &Uuid) -> Option<&HashMap<String, String>> {
         self.taskdb.tasks().get(&uuid)