Adding .gitattributes to ensure .sh files are checked out with LF

[DrEsteban]

Without this, bash scripts cannot run on Windows + WSL environments without manually fixing the line endings. Python and other tools are usually smart enough to deal with it, but not bash :(

The issue usually surfaces as described in #493

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[ckxng]

@TheFinalJoke look at this

[DrEsteban]

@TheFinalJoke @ckxng Any concerns with this PR? Can it be merged?

[barnett-yuxiang]

LGTM

[DrEsteban]

@barnett-yuxiang I think you need to initiate the merge after signing off