Feature: Add naive plugin support for pinry

pinry_plugins/apps.py

@@ -0,0 +1,9 @@
+from django.apps import AppConfig
+
+
+class PinryPluginsConfig(AppConfig):
+    name = 'pinry_plugins'
+
+    def ready(self):
+        from pinry_plugins import builder   # noqa
+        builder.init()