added one liner documentation for examples in README.md

[dnabanita7]

Description

Added documentation as required in the README.md #312

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the OpenMined Styleguide
• [ ] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests

[chinmayshah99]

We completely missed this! thanks for the PR!