colors for visual grouping of customer, projects and activities (#751)

src/Entity/ColorTrait.php

@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Entity;
+
+use Doctrine\ORM\Mapping as ORM;
+
+trait ColorTrait
+{
+    /**
+     * @var string
+     *
+     * @ORM\Column(name="color", type="string", length=7, nullable=true)
+     */
+    private $color = null;
+
+    /**
+     * @return string
+     */
+    public function getColor(): ?string
+    {
+        return $this->color;
+    }
+
+    /**
+     * @param string $color
+     * @return self
+     */
+    public function setColor(?string $color = null)
+    {
+        $this->color = $color;
+
+        return $this;
+    }
+}