updated readme and added chrome driver manager

[Kurry]

• Added .idea/ to .gitignore for pycharm users
• Added documentation about api_key to clarify it is the Consumer Key found on developer website
• Change redirect_uri to https://localhost. The variable name specifies that it is the redirection uri, so having a url that does that same is redundant. By changing the default redirection URI you satisfy those who have it set as https://localhost whereas the former satisfies no one.
• Added webdriver-manager in the example so it can run seamlessly. Chrome updates every 24 hours, and so the burden of maintaining chrome driver should be ignored. First the person would have to go to settings in Chrome to identify their Chrome version, then go to the chrome driver website to download it, then they would have to identify where the default path it should be installed for Windows or Mac OS, and then repeatedly have to do that on updates. Seams like too much of a hassle.