Add missing examples to examples/README.md (#10637)
Add missing examples to examples/README.md (#10637)

### Summary
This PR adds the missing examples to the list of examples in _examples/README.md_.

### PR Overview

- [n] This PR requires new unit tests [y/n] (make sure tests are included)
- [n] This PR requires to update the documentation [y/n] (make sure the docs are up-to-date)
- [y] This PR is backwards compatible [y/n]
- [n] This PR changes the current API [y/n] (all API changes need to be approved by fchollet)

keras-team/keras,keras-team/keras