docs: Add a quick doc of how connecting Manyverse to tildefriends.net is supposed to work.

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docs/connecting_manyverse.md

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+# Connecting with Manyverse
+
+Communication with [Manyverse](https://www.manyver.se/) should Just Work (tm).
+
+This document is intended as a cheat sheet for the instances where it doesn't.
+If your experience differs, please share so we can make things better.
+
+## Connecting Manyverse to the tildefriends.net room
+
+Open the `Connections` tab. This is from the desktop app, but mobile is similar.
+
+![Manyverse connections tab](manyverse_connections_tab.png)
+
+Open the `Connections Panel`.
+
+![Manyverse connections panel](manyverse_connections_panel.png)
+
+Use the `Add Connection` button at the bottom right to open the dialog to enter
+a connections string to add a new connection.
+
+![Manyverse connections panel](manyverse_paste_invite_code.png)
+
+Copy the tildefriends.net room code from https://www.tildefriends.net/~cory/room/.
+
+![Tilde Friends room code](tildefriends_room_app.png)
+
+Paste.
+
+On mobile especially, make sure the full text is pasted without modification.
+
+![Manyverse invite code](manyverse_code.png)
+
+Click `Done`, and you should be connected successfully. tildefriends.net is
+all things: a room, a pub, and a client, so you should be able to start replicating
+immediately as well as find other similarly connected people with whom to establish
+further connections.
+
+When logged into tildefriends.net, active connections it sees can be found on
+the `Connections` tab: https://www.tildefriends.net/~core/ssb/#connections,
+which may indicate errors if you find yourself disconnecting.