Create README.md

Author: jcoady

labextension/vpython/README.md

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+# vpython
+
+VPython labextension
+
+
+## Prerequisites
+
+* JupyterLab ^0.35.0
+* VPython Package >=7.4.8     (pip install vpython) or (conda install -c vpython vpython)
+
+## Installation
+
+```bash
+jupyter labextension install vpython
+```
+
+## Development
+
+For a development install use the instructions for creating a custom jupyter labextension as a guide:
+
+https://jupyterlab.readthedocs.io/en/stable/developer/extension_tutorial.html#extension-tutorial
+
+but taylor the instructions for creating a vpython labextension.
+
+```bash
+jlpm install
+jlpm add @jupyterlab/application
+jlpm add @jupyterlab/apputils
+jlpm add @jupyterlab/coreutils
+jlpm add @jupyterlab/docregistry
+jlpm add @jupyterlab/notebook
+jlpm add @phosphor/disposable
+jlpm add script-loader
+
+cp -r ../../vpython/vpython_{libraries,data} .
+jlpm run build
+jupyter labextension install .
+```
+
+To rebuild the package and the JupyterLab app:
+
+```bash
+jlpm run build
+jupyter lab build
+```