create dedupe stub

src/layers/dedupe.py

@@ -0,0 +1,13 @@
+from pathlib import Path
+from dir import Root
+from layer import Layer
+
+
+class Dedupe(Layer):
+    def __init__(self, other: Root, log_path: Path):
+        super().__init__(log_path, "TCD")
+        self.other = other
+
+
+    def __process(self, root: Root):
+        pass