Add docs page for binary file uploads, for #500

[jonathanbp]

This PR adds a new page to the docs dir giving an example of how to do binary file uploads from the discussion on #500.

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[johanbrandhorst]

This looks great, thanks @jonathanbp 😄. A few comments on the example.

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[jonathanbp]

@googlebot I fixed it.

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[jonathanbp]

@googlebot I fixed it.

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[jonathanbp]

@googlebot I consent.

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[jonathanbp]

Alright, I've updated the PR according to your suggestions, @johanbrandhorst .

[johanbrandhorst]

Great, thanks for the updates. Unfortunately the CLA bot is confused because some of the commits are under your current github user and some are under @purebadger. Could you try and squash the commits to be all under the same user, or log into @purebadger and sign the CLA, either will work.

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[purebadger]

Ah, yes. To add to the confusion, I signed the CLA using the wrong google account.

[purebadger]

@googlebot I consent.

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[purebadger]

Can't get the CLA to work. I'm scratching this PR and doing a new one without involving @purebadger this time.