Materials for Python bytearray

[bzaczynski]

Where to put new files:

• New files should go into a top-level subfolder, named after the article slug. For example: my-awesome-article

How to merge your changes:

1. Make sure the CI code style tests all pass (+ run the automatic code formatter if necessary).
2. Find an RP Team member on Slack and ask them to review & approve your PR.
3. Once the PR has one positive ("approved") review, GitHub lets you merge the PR.
4. 🎉

[lpozo]

@bzaczynski Hey!

I wonder whether we can add some short examples from all the REPL examples we have in the article. Maybe the different ways to create bytearray objects and other useful examples. Of course, we'd need to add print() calls to produce output because we're not in a REPL. What do you think? Maybe, we can group the examples in a couple of .py file.