Add latexify notebook

[priyanshuone6]

Description

Add latexify notebook in examples

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[codecov]

Codecov Report

Merging #1596 (b8ea482) into develop (4ebecbc) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1596   +/-   ##
========================================
  Coverage    97.92%   97.93%           
========================================
  Files          324      324           
  Lines        18150    18221   +71     
========================================
+ Hits         17773    17844   +71     
  Misses         377      377           

Impacted Files	Coverage Δ
pybamm/expression_tree/binary_operators.py	99.51% <100.00%> (ø)
pybamm/expression_tree/concatenations.py	98.25% <100.00%> (ø)
pybamm/expression_tree/functions.py	100.00% <100.00%> (ø)
pybamm/expression_tree/independent_variable.py	100.00% <100.00%> (ø)
pybamm/expression_tree/operations/latexify.py	100.00% <100.00%> (ø)
pybamm/expression_tree/parameter.py	100.00% <100.00%> (ø)
pybamm/expression_tree/printing/print_name.py	100.00% <100.00%> (ø)
pybamm/expression_tree/scalar.py	100.00% <100.00%> (ø)
pybamm/expression_tree/symbol.py	98.25% <100.00%> (ø)
pybamm/expression_tree/unary_operators.py	100.00% <100.00%> (ø)
... and 6 more

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[priyanshuone6]

All done, it is ready to be reviewed now

[valentinsulzer]

nice!!

[valentinsulzer]

Looks good, will merge when tests pass