Add isPluginInstalled function

src/utils/isPluginInstalled.js

@@ -0,0 +1,9 @@
+/*
+ * Copyright (C) 2020 CZ.NIC z.s.p.o. (http://www.nic.cz/)
+ *
+ * This is free software, licensed under the GNU General Public License v3.
+ * See /LICENSE for more information.
+ */
+
+export const isPluginInstalled = (pluginName) =>
+    ForisPlugins.some((plugin) => plugin.name === pluginName);