Added memory editing functionality

sia/entry/read_entry.py

@@ -34,6 +34,14 @@ class ReadEntry(Entry):
             self.content = self._io_buffer.read()
             self.read = True
             self.notify_change()
+    
+    def reset(self) -> None:
+        """
+        Reset the entry state to its initial state.
+        """
+        self.read = False
+        self.content = ""
+        self.notify_change()
 
     def generate_context(self) -> ET.Element:
         """