Add markdown/link checker integration to repo

[booyaa]

Blocked: Need to check wirth main team it's okay to add content-o-tron collaborates to the Rust Community org. This is a permissions issue, we need a member of the Community org to add Travis.

Description

To help spot broken links when writing any project documentation (written in markdown).

Tool to use (alternatives are welcome): https://github.com/dkhamsing/awesome_bot

Validation should occur during pull request. Instructions on how to do this can be found here

Estimation

3.5 hours

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Admin use only (please leave as-is do not delete from issue)

Collaborators: @adityac8
Mentor: @booyaa

[adityac8]

Hey, I would like to work on this one 😃

[booyaa]

It's yours thank you!

[adityac8]

Hey @booyaa What exactly do we mean by

pull request integration

Is it something to do with
https://github.com/rust-unofficial/awesome-rust/blob/master/CONTRIBUTING.md

[booyaa]

It looks like the markdown linter vanished after the repo was transferred to rust-community org. Let me update the issue, to provide more details.

[booyaa]

Updated the issue, let me know if you have any more questions!

[adityac8]

User from https://github.com/rust-community can add Travis or might need permission.

[adityac8]

Hey @booyaa We can remove blocked now. I'm adding Travis.

[adityac8]

I think we can close this now 😎

[booyaa]

Cool thanks!