Add an FAQ and/or high-level overview of how to integrate TUF

[vladimir-v-diaz]

We are often asked the same questions regarding delegations, how to organize TUF metadata, key management, etc. There should be an FAQ page for these sorts of questions.

The Survivable Key Compromise paper provides an overview of TUF's design, and the specification and other documents available here capture most of what it contains. However, the integration side of things is not adequately explained outside of the Diplomat and Mercury papers. The PEP 458 document is also a good resource for how to integrate TUF with an existing software updater and community repository.

We should provide a condensed, high-level document that contains the information in the papers and documents that have been written since the Survivable Key Compromise paper.

[vladimir-v-diaz]

We are working on an FAQ page for the website. See theupdateframework/theupdateframework.github.io#29. There should also be a document that captures more of the recent developments from the Mercury and Diplomat papers.

[MVrachev]

I don't think this is a good-first-issue. To write such a page one should understand how TUF works.

[lukpueh]

Duplicate of #2452