add missing basket examples

[bblfish]

see #541

It turns out that the code in the README was ok as is, but for some reason the first few times I tried it I could not get it to work at all, so I thought that the examples in the README were missing something. That led me to search in the history.
After adding them to the repo I found that it worked.

Note that I am not a python programmer, I am new to yaml, and to the whole project, so it could have been simple things like formatting that were the problem. But that is good reason to add those examples to the repository, and perhaps even test them with the unit tests (but I am not sure how to do that yet)

$ schema-salad-tool basket_schema.yml basket.yml
/Users/hjs/Library/Python/3.8/bin/schema-salad-tool Current version: 8.3.20220525163636
Document `basket.yml` is valid

[codecov]

Codecov Report

Merging #542 (78f7d7f) into main (73cf507) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #542   +/-   ##
=======================================
  Coverage   81.54%   81.54%           
=======================================
  Files          19       19           
  Lines        3635     3635           
  Branches     1009     1009           
=======================================
  Hits         2964     2964           
  Misses        436      436           
  Partials      235      235           

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[mr-c]

Thank you @bblfish ! I've asked @tetron to double check this before we merge.