Add a __init__.py

This repo can now be git cloned to the custom_nodes folder.

__init__.py

@@ -0,0 +1,21 @@
+import importlib
+import os
+
+node_list = [ #Add list of .py files containing nodes here
+    "advanced_model_merging",
+    "reference_only",
+    "sampler_rescalecfg",
+    "sampler_tonemap",
+    "sdxl_model_merging"
+]
+
+NODE_CLASS_MAPPINGS = {}
+NODE_DISPLAY_NAME_MAPPINGS = {}
+
+for module_name in node_list:
+    imported_module = importlib.import_module(".{}".format(module_name), __name__)
+
+    NODE_CLASS_MAPPINGS = {**NODE_CLASS_MAPPINGS, **imported_module.NODE_CLASS_MAPPINGS}
+    NODE_DISPLAY_NAME_MAPPINGS = {**NODE_DISPLAY_NAME_MAPPINGS, **imported_module.NODE_DISPLAY_NAME_MAPPINGS}
+
+__all__ = ['NODE_CLASS_MAPPINGS', 'NODE_DISPLAY_NAME_MAPPINGS']