Add Tilde Friends Diagram

Tilde-Friends-Diagram.md

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+# Tilde Friends Diagram
+
+This is a diagram of one way to think of Tilde Friends, more or less as a computer of its own where the user interface is through a web browser, storage is in a single SQLite database structured for the Secure Scuttlebutt social network plus arbitrary key/value pairs, and communication with the outside world is all via Secure Scuttlebutt.
+
+```mermaid
+flowchart TB
+  browser[Web Browser] --> tildefriendsdotnet
+  tildefriendsdotnet[tildefriends.net] --> tildefriends
+  android[Android App] --> tildefriends
+  iphone[iPhone App] --> tildefriends
+  tildefriends <--> apps[Sandboxed Apps]
+  tildefriends <--> editor
+  browser --> editor[Editor]
+  android --> editor
+  iphone --> editor
+  editor --> apps
+  tildefriends --> ssb_messages[SSB Messages]
+  tildefriends --> ssb_blobs[SSB Blobs]
+  tildefriends --> tf_properties[Key/Value Storage]
+  ssb_messages --> sqlite[db.sqlite\nSQLite Database]
+  ssb_blobs --> sqlite
+  tf_properties --> sqlite
+  tildefriends <--> ssb[Other SSB Clients]
+```