Add dependencies/vendor (whatsapp)

vendor/go.mau.fi/whatsmeow/README.md

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+# whatsmeow
+[![godocs.io](https://godocs.io/go.mau.fi/whatsmeow?status.svg)](https://godocs.io/go.mau.fi/whatsmeow)
+
+whatsmeow is a Go library for the WhatsApp web multidevice API.
+
+This was initially forked from [go-whatsapp] (MIT license), but large parts of
+the code have been rewritten for multidevice support. Parts of the code are
+ported from [WhatsappWeb4j] and [Baileys] (also MIT license).
+
+[go-whatsapp]: https://github.com/Rhymen/go-whatsapp
+[WhatsappWeb4j]: https://github.com/Auties00/WhatsappWeb4j
+[Baileys]: https://github.com/adiwajshing/Baileys
+
+## Discussion
+Matrix room: [#whatsmeow:maunium.net](https://matrix.to/#/#whatsmeow:maunium.net)
+
+## Usage
+The [godoc](https://godocs.io/go.mau.fi/whatsmeow) includes docs for all methods and event types.
+There's also a [simple example](https://godocs.io/go.mau.fi/whatsmeow#example-package) at the top.
+
+Also see [mdtest](./mdtest) for a CLI tool you can easily try out whatsmeow with.
+
+## Features
+Most core features are already present:
+
+* Sending messages to private chats and groups (both text and media)
+* Receiving all messages
+* Managing groups and receiving group change events
+* Joining via invite messages, using and creating invite links
+* Sending and receiving typing notifications
+* Sending and receiving delivery and read receipts
+* Reading app state (contact list, chat pin/mute status, etc)
+* Sending and handling retry receipts if message decryption fails
+
+Things that are not yet implemented:
+
+* Writing app state (contact list, chat pin/mute status, etc)
+* Sending status messages or broadcast list messages (this is not supported on WhatsApp web either)
+* Calls