Ivan - Create article and topic datastore [skip ci]

server/models/Article.php

@@ -0,0 +1,14 @@
+<?php
+
+class Article extends DataStore {
+    const TABLE  = 'article';
+
+    public function getProps() {
+        return [
+            'title',
+            'content',
+            'lastEdited',
+            'position'
+        ];
+    }
+}

server/models/Topic.php

@@ -0,0 +1,14 @@
+<?php
+
+class Topic extends DataStore {
+    const TABLE = 'topic';
+
+    public function getProps() {
+        return [
+            'name',
+            'icon',
+            'iconColor',
+            'ownArticleList'
+        ];
+    }
+}