Add calendar event color docs to gog skill

skills/gog/SKILL.md

@@ -17,7 +17,11 @@ Setup (once)
 Common commands
 - Gmail search: `gog gmail search 'newer_than:7d' --max 10`
 - Gmail send: `gog gmail send --to a@b.com --subject "Hi" --body "Hello"`
-- Calendar: `gog calendar events <calendarId> --from <iso> --to <iso>`
+- Calendar list events: `gog calendar events <calendarId> --from <iso> --to <iso>`
+- Calendar create event: `gog calendar create <calendarId> --summary "Title" --from <iso> --to <iso>`
+- Calendar create with color: `gog calendar create <calendarId> --summary "Title" --from <iso> --to <iso> --event-color 7`
+- Calendar update event: `gog calendar update <calendarId> <eventId> --summary "New Title" --event-color 4`
+- Calendar show colors: `gog calendar colors`
 - Drive search: `gog drive search "query" --max 10`
 - Contacts: `gog contacts list --max 20`
 - Sheets get: `gog sheets get <sheetId> "Tab!A1:D10" --json`
@@ -28,6 +32,22 @@ Common commands
 - Docs export: `gog docs export <docId> --format txt --out /tmp/doc.txt`
 - Docs cat: `gog docs cat <docId>`
 
+Calendar Colors
+- Use `gog calendar colors` to see all available event colors (IDs 1-11)
+- Add colors to events with `--event-color <id>` flag
+- Event color IDs:
+  - 1: Lavender (#a4bdfc)
+  - 2: Sage (#7ae7bf)
+  - 3: Grape (#dbadff)
+  - 4: Flamingo (#ff887c)
+  - 5: Banana (#fbd75b)
+  - 6: Tangerine (#ffb878)
+  - 7: Peacock (#46d6db)
+  - 8: Graphite (#e1e1e1)
+  - 9: Blueberry (#5484ed)
+  - 10: Basil (#51b749)
+  - 11: Tomato (#dc2127)
+
 Notes
 - Set `GOG_ACCOUNT=you@gmail.com` to avoid repeating `--account`.
 - For scripting, prefer `--json` plus `--no-input`.