Document battlefield colors and Continuumorphous font setup

doc/continuumatrice-battlefield.md

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+# Continuumatrice battlefield style
+
+Cockatrice's three visual table rows are reused as **Front**, **Support**, and **Command**. This is purely a display change: the server still sees a single `table` zone.
+
+| Card XML `<tablerow>` | Position |
+| --- | --- |
+| `0` | Front |
+| `1` | Support |
+| `2` | Command |
+
+## Optional color customization
+
+Create `battlefield.ini` in the active Cockatrice theme directory:
+
+```ini
+[Zones]
+Front = #A08E343D
+Support = #A0286981
+Command = #A05E428C
+```
+
+The Qt color notation is `#AARRGGBB`, including transparency. Without this file, built-in red, teal, and purple shades are used. Reload the theme to apply changes. The row order follows the player's mirrored/inverted layout, so Front always faces the battlefield center.
+
+## Font
+
+To render labels using your own **Continuumorphous Regular**, copy either `Continuumorphous-Regular.ttf` or `Continuumorphous-Regular.otf` into `fonts/` inside the current theme directory, or into a `fonts/` directory beside the Continuumatrice executable.
+
+The font is also detected if already installed as "Continuumorphous Regular" or "Continuumorphous". If not found, a Qt default font is used. The font asset is not included in this change; no resource entry was added that would break builds when the file is missing.
+
+## Compatibility
+
+The existing drag/drop, row mapping, stacking, card counters, playmats, and multiplayer protocols are preserved. This does **not** enforce gameplay placement restrictions.