Add DocC bundle

Author: 0xTim

Sources/JWT/Docs.docc/index.md

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+# ``JWT``
+
+JWT provides integrations between [JWTKit](https://github.com/vapor/jwt-kit) and [Vapor](https://github.com/vapor/vapor) to make it easy to work with JWTs in your Vapor application.
+
+For more details, see the [Vapor Docs](https://docs.vapor.codes/security/jwt/).