[add] Readme in package

[edit] target frameworks
[up] deps to latest

Merge pull request #22 from rpagyc/master

Added ContentType field in RequestBody attribute

[edit] version/changelog, readme

[up] to release Simplify.Web 5.0

[edit] version/changelog

[add] swagger launch URL in VS

[spec] up versions

[edit] changelog

[fix] license file path