Add some README.mds

packages/settingeditor-extension/README.md

@@ -1 +1,3 @@
 # @jupyterlab/settingeditor-extension
+
+An extension for JupyterLab which provides a user-editable interface for the JupyterLab [settings registry](../apputils/src).

packages/shortcuts-extension/README.md

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 # @jupyterlab/shortcuts-extension
+
+An extension for JupyterLab which registers keyboard shortcuts for the application.

packages/tabmanager-extension/README.md

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 # @jupyterlab/tabmanager-extension
+
+An extension for JupyterLab which provides a listing in the left area for all the currently open documents and widgets in the dock panel.

packages/terminal-extension/README.md

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 # @jupyterlab/terminal-extension
+
+An extension for JupyterLab which provides an entry point and commands for the [@jupyterlab/terminal](../terminal) package.

packages/terminal/README.md

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 # @jupyterlab/terminal
+
+A JupyterLab package which provides a bash terminal for the user to access and send commands to the underlying server.

packages/theme-dark-extension/README.md

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 # @jupyterlab/theme-dark-extension
+
+A JupyterLab theme extension which provides the default dark-colored theme.

packages/theme-light-extension/README.md

@@ -1 +1,3 @@
 # @jupyterlab/theme-light-extension
+
+A JupyterLab theme extension which provides the default light-colored theme.

packages/tooltip-extension/README.md

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 # @jupyterlab/tooltip-extension
+
+A JupyterLab extension which provides an entry-point, commands, and keyboard shortcuts for the [@jupyterlab/tooltip](../tooltip) package.

packages/tooltip/README.md

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 # @jupyterlab/tooltip
+
+An package for JupyterLab which renders tooltip information from a kernel, for use in Jupyter notebooks and consoles.

packages/vega2-extension/README.md

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 # @jupyterlab/vega2-extension
+
+A mime-renderer extension for JupyterLab that provides support for rendering Vega and Vega-lite documents and mimebundles.