revised developer notes, added Table of Contents

[k0emt]

• Add a README with table of contents
• Add information about how to build the project
• Update cobra documentation
• various formatting and linting fixes

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (89d649a) 81.84% compared to head (5b3b6c7) 81.84%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #93 +/- ## ======================================= Coverage 81.84% 81.84% ======================================= Files 17 17 Lines 1366 1366 ======================================= Hits 1118 1118 Misses 214 214 Partials 34 34 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=on4kjm). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=on4kjm)

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