docs: add auth and context

[sandros94]

Resolves #88

Should I also add an auth example via cookie?

I might need some help on the ok: false backward compatible thing

[codecov]

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@@           Coverage Diff           @@
##             main     #112   +/-   ##
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  Coverage        ?   76.23%           
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  Files           ?        9           
  Lines           ?      711           
  Branches        ?      145           
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  Hits            ?      542           
  Misses          ?      167           
  Partials        ?        2           

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[travis-r6s]

Thanks @sandros94, this gave me some much needed guidance! However, I found that setting the context to an object doesn't work, you have to set specific properties. For example (using crossws@0.3.3):

Trying to set request.context to a new object:

upgrade(request) {
  request.context = { data: 'test'}
},
open(peer) {
  console.log(peer.context) // logs {}
}

Setting a specific property in request.context:

upgrade(request) {
  request.context.data = 'test'
},
open(peer) {
  console.log(peer.context) // logs { data: 'test' }
}

[sandros94]

@travis-r6s thanks for reporting it!

Indeed context is already initialized 😅

[pi0]

Good point @travis-r6s ~> #115