docs: add readme files in docs/examples

[akihikokuroda]

Misc PR

Type of PR

• Bug Fix
• New Feature
• Documentation
• Other

Description

• Link to Issue: fix doc: add readme file in each docs/examples directories #350

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code as added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

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🟢 Enforce conventional commit

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert|release)(?:\(.+\))?:

[psschwei]

+1 for adding readmes for the examples
Based on a quick sampling it doesn't seem like the examples are undergoing frequent revision (if they were, we'd need a strategy around keeping them up to date).

[planetf1]

I think these are really useful, and will help with searches. LGTM