Development of high-level documentation

[mands]

User Story

• As a prospective end-user, I want to be able to understand the NStack proposition, so that I can determine its features and offerings wrt my needs

Acceptance Criteria

• High level documentation that explains NStack and its features

Question

• Do we need a better docs platform?

Notes

• Preferably accomplished in conjunction with a technical writer

XRefs

KR - nstack/nstack-org#57
Related - #69 #70