Add a function that prettifies image plotting

[cjtu]

Write a function in helpers.py that:

• uses the matplotlib.pyplot.imshow() function
• uses pyplot options to make the plot prettier in some way
• Any of the following could make the plot prettier, you can choose some or do all
  • Add a title
  • Add x and y labels
  • Choose a custom color palette (Kudos if it's colorblind compliant)
  • Display the x and y axes in lat / lon instead of pixels (requires a bit of math)

Add an example in jupyter_notebooks/ (you can edit tutorial.ipynb or make your own notebook) which shows how to call this function and the cool options you added.

[jenniferbuz]

I want to work on it