add examples

examples/packages/advanced-example/setup.py

@@ -0,0 +1,12 @@
+from setuptools import setup
+
+setup(
+    name='lektor-advanced',
+    py_modules=['lektor_advanced'],
+    version='1.0',
+    entry_points={
+        'lektor.plugins': [
+            'advanced = lektor_advanced:AdvancedGroupByPlugin',
+        ]
+    }
+)