Provide Guidance for Linux Anaconda Installation

[jvallentine1211]

Just like #11 for Windows, it would be helpful to provide Linux guidance on whether to accept the defaults or not.

[aculich]

Here we probably want to suggest they ignore the default and instead type yes when it asks:

Do you wish the installer to initialize Anaconda3 by running conda init? [yes|no]`

That way their environment will be automatically set up without going through extra steps.