Add Extension examples and FAQ

001-Extensions/AppMode.ipynb

001-Extensions/CodeFormatter.ipynb

001-Extensions/Leaflet.ipynb

001-Extensions/Sample640.mp4

001-Extensions/Sidecar.ipynb

001-Extensions/ThreeJS.ipynb

001-Extensions/WebRTC.ipynb

001-Extensions/europe_110.geo.json

001-Extensions/master.tex

001-Extensions/test.py

001-Extensions/voila_basics.ipynb

.../.ipynb_checkpoints/JupyterLab Interface-checkpoint.ipynb

...ebook/.ipynb_checkpoints/Notebook Basics-checkpoint.ipynb

...ials/003-Notebook/.ipynb_checkpoints/README-checkpoint.md

...Notebook/images/.ipynb_checkpoints/running-checkpoint.png

...03-Notebook/images/.ipynb_checkpoints/tabs-checkpoint.png

...ls/001-IPython-Kernel/Animations Using clear_output.ipynb

...-Basic-Tutorials/001-IPython-Kernel/Background Jobs.ipynb

...ic-Tutorials/001-IPython-Kernel/Beyond Plain Python.ipynb

...Basic-Tutorials/001-IPython-Kernel/Capturing Output.ipynb