docs: update README.md to match new examples

[karel-rehor]

…irement for some PyArrow data conversion methods.

Closes #211

Proposed Changes

Replace mention of Pokeman trainer jupyter notebook with mention of new jupyter notebook and link. Mention new ./examples directory.

Mention need for pandas when using some PyArrow data conversion methods, when using NS timestamp precision.

Checklist

• CHANGELOG.md updated N.A.
• Rebased/mergeable
• A test has been added if appropriate N.A.
• Tests pass
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.17%. Comparing base (60f7e0a) to head (d07a51c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #212   +/-   ##
=======================================
  Coverage   75.17%   75.17%           
=======================================
  Files          35       35           
  Lines        2417     2417           
=======================================
  Hits         1817     1817           
  Misses        600      600           

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