Add sets for gender and object form

src/MDGenderSet.php

@@ -0,0 +1,32 @@
+<?PHP
+/**
+ * Contains a class for listing the possible genders.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Contains a class for listing the possible genders.
+ */
+final class MDGenderSet extends MDValueSet {
+
+    const GENDERS = [
+        '',
+        'female',
+        'male',
+        'gender',
+    ];
+
+    /**
+     * Gets a sorted list of the entries in a translated version.
+     *
+     * @param MDTlLoader $tlLoader Translation loader.
+     *
+     * @return array<string>
+     */
+    public static function getSortedList(MDTlLoader $tlLoader):array {
+        return parent::getTlSortedList($tlLoader, self::GENDERS, "gender_set", "gender_set");
+
+    }
+}