Document integration with tools and other libraries

[phansch]

Once webdriver-install has a solid API, we need to have documentation that shows how to use it with other tools:

• Different CI platforms
• https://github.com/rustwasm/wasm-pack
  • They have their own webdriver setup: https://github.com/rustwasm/wasm-pack/tree/master/src/test/webdriver but that wasn't updated in over a year.
• https://github.com/stevepryde/thirtyfour