document auto tool calling in README

[aniketmaurya]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

document auto tool call

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88%. Comparing base (54ccb1b) to head (33544fe).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@        Coverage Diff         @@
##           main   #31   +/-   ##
==================================
  Coverage    88%   88%           
==================================
  Files         6     6           
  Lines       417   417           
==================================
  Hits        368   368           
  Misses       49    49           

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