Migrate the IANA application document to here

[daviddias]

This was made by @mildred here: ipfs/specs#75

@nicola can you make sure this is included in the IPLD specs repo and taken care of?

[nicola]

That is an old document that must be rewritten eventually!

[rvagg]

Closing due to staleness as per team agreement to clean up the issue tracker a bit (ipld/team-mgmt#28). This doesn't mean this issue is off the table entirely, it's just not on the current active stack but may be revisited in the near future. If you feel there is something pertinent here, please speak up, reopen, or open a new issue. [/boilerplate]

[rvagg]

further to my boilerplate, this is active and we've moved to #162 for tag 42