Add graph view

README.md

@@ -296,6 +296,13 @@ it back), with Source (Ctrl+E) for the plain text; **Separate** keeps View
 and Edit as two modes. Images show in the app;
 videos and other files open in their default program (Open Externally).
 
+**Graph** (the toolbar's graph button or Ctrl+G here, the Graph button at
+the top of the web view's sidebar) shows everything under a root, or under
+the current directory, as dots like Obsidian's graph: directories purple,
+files white, each joined to its parent directory and to the files that
+reference it (Markdown links and images, `[[wiki links]]` and portals).
+Hover a dot to light up its links, click it to open it.
+
 Rename takes a `/` to move, like the web view (`../Archive/Notes.md`).
 Shortcuts: Enter opens, Backspace goes up, F2 renames, Delete deletes,
 Ctrl+N / Ctrl+Shift+N new file / directory, Ctrl+R refreshes, Ctrl+B