Tutorial added to readme

Author: sichinaga

tutorials/README.md

@@ -24,6 +24,7 @@ An additional PDF tutorial ([DSWeb contest winner](https://dsweb.siam.org/The-Ma
 | Tutorial16 [[.ipynb](tutorial16/tutorial-16-rdmd.ipynb), [.py](tutorial16/tutorial-16-rdmd.py), [.html](http://pydmd.github.io/PyDMD/tutorial16-rdmd.html)]     | Randomized DMD for greater computation speedup | `pydmd.RDMD`        |
 | Tutorial17 [[.ipynb](tutorial17/tutorial-17-edmd.ipynb), [.py](tutorial17/tutorial-17-edmd.py), [.html](http://pydmd.github.io/PyDMD/tutorial17-edmd.html)]     | Extended DMD for nonlinear eigenfunction discovery | `pydmd.EDMD`        |
 | Tutorial18 [[.ipynb](tutorial18/tutorial-18-lando.ipynb), [.py](tutorial18/tutorial-18-lando.py), [.html](http://pydmd.github.io/PyDMD/tutorial18-lando.html)]     | LANDO for nonlinear system modeling | `pydmd.LANDO`        |
+| Tutorial19 [[.ipynb](tutorial19/tutorial-19-havok.ipynb), [.py](tutorial19/tutorial-19-havok.py), [.html](http://pydmd.github.io/PyDMD/tutorial19-havok.html)]     | HAVOK for modeling chaos with partial measurements | `pydmd.HAVOK`        |