feature: add Palette enum

Author: g105b

src/Palette.php

@@ -0,0 +1,21 @@
+<?php
+namespace Gt\Cli;
+
+enum Palette:int {
+	case BLACK = 0;
+	case RED = 1;
+	case GREEN = 2;
+	case YELLOW = 3;
+	case BLUE = 4;
+	case MAGENTA = 5;
+	case CYAN = 6;
+	case WHITE = 7;
+
+	public function getForegroundCode():string {
+		return (string)(30 + $this->value);
+	}
+
+	public function getBackgroundCode():string {
+		return (string)(40 + $this->value);
+	}
+}