Botkit: Telegram support

[matueranet]

It would be awesome if botkit could also support Telegram messenger bots.

[Now2407]

I second this! I also need this as well.

[peterswimm]

This has been added if you are a [Microsoft Bot Framework ]https://github.com/howdyai/botkit/blob/master/readme-botframework.md)user.

[st-fresh]

@peterswimm - Got broken link there -- is link updated ? Can't find it

[marten-cz]

@st-fresh https://github.com/howdyai/botkit/blob/master/docs/readme-botframework.md