Cloud identity docs

This PR adds the Cloud Identity service to our documentation. We need the following language samples:

- [x] Bash
- [ ] C#
- [x] Golang
- [ ] Java
- [ ] Javascript
- [x] PHP
- [ ] Python
- [x] Ruby
Do you have any suggestions that can add clarity? Personally I don't think it's an issue because this section makes it explicit that we're updating a user - could be the same, could be another.