Adding HARK-SSJ-notebook [WIP]

[wdu9]

Please ensure your pull request adheres to the following guidelines:

• [ ] Tests for new functionality/models or Tests to reproduce the bug-fix in code.
• [ ] Updated documentation of features that add new functionality.
• [ ] Update CHANGELOG.md with major/minor changes.

The notebook "KS-HARK-presentation-notebook.ipynb" in the folder that was added to examples does not work with any version of HARK that can be pip installed.

The notebook instead calls on the a local version of HARK that is closest to econ-ark==0.13.0

With econ-ark==0.13.0, the notebook will not produce any errors but there will be a bug in the computation in the Jacobians as well as the steady state values of aggregate consumption.