KMS Documentation/Tutorial. How to run a Validator with a Ledger device

[jleni]

Adding a new section for KMS including:

• Build instructions
• Configuration examples:
  • YubiHSM
  • Ledger Tendermint App
• Frequently asked questions

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• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/)
• Added entries in PENDING.md with issue #
• rereviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[jleni]

This is definitely work in progress and there are still a few issues that need to be solved.

I thought it was a good idea to share as early feedback is appreciated.

I will add more information once we release a KMS + signatory version that includes a few additional fixes.

Related to tendermint/tmkms#172

[jleni]

@liamsi @gamarin2 this is very much work in progress but maybe you can provide some quick feedback. This is an area where documentation was lacking as far as I know.

[jleni]

It would be good to start reviewing this. Maybe @gamarin2 you can have a look at it and help with any missing details?

[fedekunze]

LGTM. Maybe @liamsi or @gamarin2 could review as well