[S] Documentation signpost added

[e-kharion]

• added new documentation readme page which contains categorized links to all other documentation pages in this repository with brief description
• documentation section in repo readme file updated with a link to documentation readme

[e-kharion]

@e-kharion please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

@dotnet-policy-service agree [company="{your company}"]

Options:

• (default - no company specified) I have sole ownership of intellectual property rights to my Submissions and I am not making Submissions in the course of work for my employer.

@dotnet-policy-service agree

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@dotnet-policy-service agree company="Microsoft"

Contributor License Agreement

@dotnet-policy-service agree company="Microsoft"

[DrewScoggins]

Few spelling things, but otherwise LGTM.

[DrewScoggins]

LGTM

[LoopedBard3]

This looks good to me 👍.