Add working example for Tumblr

[galois17]

This is a working Tumblr example. They're one of the rare ones that still support OAuth1a. Other examples in the examples/ folder may even work right now.

[pboling]

This is awesome!

[pboling]

I'll clean up the style failures in CI - not your fault. I need to add a .rubocop file to root to restrict rubocop from loading the rules of dependencies. It is breaking in every one of my repos.

Merging

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (39c8a76) to head (94930de).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@     Coverage Diff     @@
##   main   #346   +/-   ##
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