updated readme

[mdarmanin]

Fixes #[replace brackets with the issue number that your pull request addresses].

Changes proposed in this pull request:

• Updated the Readme.md to include an important step in the setup process
• Another small touchup to the readme.md, them blasted typos.

cc @HospitalRun/core-maintainers

[jkleinsc]

@mdarmani thanks for the PR! Can you update the description of what you changed? I know this is a simple change, but it really helps us a project maintainers to understand what PRs are intended for. I specifically mean this text below should be replaced. If your PR doesn't fix an issue you can drop that part out, but there should be some kind of description of the change.
Fixes #[replace brackets with the issue number that your pull request addresses].

Changes proposed in this pull request:

• [list out summary of changes here]
• [list out summary of changes here]
• [list out summary of changes here]
• [etc]

Note: pull requests without proper descriptions may simply be closed without further discussion. We appreciate your contributions, but need to know what you are offering in clearly described format. Thanks! (you can delete this text)

[jkleinsc]

Thanks for the addition, I think the text should be slightly tweaked as suggested below:

[jkleinsc]

Saying "In some cases" is kind of confusing. Maybe you could say something like, if npm start doesn't work you you, you can try ember serve as an alternative?

[jkleinsc]

Just needs a slight grammar tweak.

[jkleinsc]

I think you meant to say "If npm start doesn't work for you

[jkleinsc]

@mdarmani Looks good to me. Thanks for the PR! I'll merge it in.