Updating README to have more background, example usage, and more detailed installation instructions

[maxlindbergh]

Summary

I've added some project background to make the goals and capabilities of this project more clear to people not familiar with the codebase. Additionally, I've added an "Example Usage" section to the README so that it is, again, more clear to new users how they can use this software.

Finally, I've added a bit of description to each of the three installation options. I've put in some information on how they differ and when each case should be used.

Test plan

This is purely a documentation change so no real testing is required.

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