Added chapters and list of exercises

CH_02_interactive_python/README.rst

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+Chapter 2 - interactive python
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+
+1. The `rlcompleter` enhancement we created currently only handles dictionaries. Try and extend the code so it supports lists, strings, and tuples as well.
+2. Add colors to the completer (hint: use `colorama` for the coloring).
+3. Instead of manually completing using our own object introspection, try and use the `jedi` library for autocompletion, which does static code analysis.
+4. Try to create a `Hello` `<ipywidget>` so the name of the person can be edited through a notebook without code changes.
+5. Try and create a script that will look for a given pattern through all of your previous ipython sessions.