Write-tree ignore .ugit files

ugit/base.py

@@ -7,8 +7,14 @@ def write_tree(directory="."):
     with Path.iterdir(directory) as it:
         for entry in it:
             full = f"{directory}/{entry.name}"
+            if is_ignored(full):
+                continue
             if entry.is_file(follow_symlinks=False):
                 # TODO write the file to object store
                 print(full)
             elif entry.is_dir(follow_symlinks=False):
                 write_tree(full)
+
+
+def is_ignored(path):
+    return ".ugit" in path.split("/")