Implement move instruction

karaokatalog/instructions/MoveInstruction.py

@@ -1,3 +1,4 @@
+import shutil
 from dataclasses import dataclass
 from pathlib import Path
 
@@ -15,4 +16,7 @@ class MoveInstruction(Instruction):
     new_path: Path
 
     def __call__(self) -> None:
-        raise NotImplementedError()  # TODO
+        if self.new_path.exists():
+            raise FileExistsError("New path already exists, not moving anything")
+
+        shutil.move(self.old_path, self.new_path)