Updated README.md with Helm instructions and small cleanup for admiss…

[jeremyrickard]

Purpose

This PR adds some documentation changes to instruct the user to install Helm and provides instructions for initializing Tiller.

Does this introduce a breaking change?

[ ] Yes
[ x ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ x ] Documentation content changes
[ ] Other... Please describe:

[rbitia]

LGTM! Let's merge