Guide: How to build a simple SLP app

[blockparty-sh]

Intro to slpdb, slpsocket, and slpjs

Create a wallet, send tokens from it, see query those tokens using slpsocket and slpdb

Targetting first time SLP developers

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should add a section about future architecture, and forwarning that SLP DB relies on Bitbox which runs on bcom rest API and no longer maintained?