Merge pull request #3461 from ibdafna/add_readme

Add trimmed down readme file

Author: jasongrout

python/ipywidgets/README.md

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+# ipywidgets: Interactive HTML Widgets
+
+**ipywidgets**, also known as jupyter-widgets or simply widgets, are
+[interactive HTML widgets](https://github.com/jupyter-widgets/ipywidgets/blob/master/docs/source/examples/Index.ipynb)
+for Jupyter notebooks and the IPython kernel.
+
+This package contains the python implementation of the core interactive widgets bundled in ipywidgets.
+
+## Core Interactive Widgets
+
+The fundamental widgets provided by this library are called core interactive
+widgets. A [demonstration notebook](https://github.com/jupyter-widgets/ipywidgets/blob/master/docs/source/examples/Index.ipynb)
+provides an overview of the core interactive widgets, including:
+
+- sliders
+- progress bars
+- text boxes
+- toggle buttons and checkboxes
+- display areas
+- and more
+
+
+For more information, see the main [documentation](https://github.com/jupyter-widgets/ipywidgets#readme).
+
+