Draft for the 2.x -> 3.x migration guide

docs/source/developer/extension_migration_2_3.rst

@@ -0,0 +1,16 @@
+.. _extension_migration_2_3:
+
+JupyterLab 2.x to 3.x Extension Migration Guide
+------------------------------------------------
+
+This is a migration guide for updating extensions that support JupyterLab 2.x to work in JupyterLab 3.x.
+
+Upgrading Library Versions
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+TODO
+
+Publishing the extension to PyPI and conda-forge
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+TODO

docs/source/index.rst

@@ -65,5 +65,6 @@ JupyterLab is the next-generation web-based user interface for Project Jupyter.
    developer/terminology
    developer/extension_tutorial
    developer/extension_migration
+   developer/extension_migration_2_3
    developer/api