add new demo symfony files

app/config/routes/annotations.yaml

@@ -0,0 +1,8 @@
+controllers:
+    resource: '../../src/Controller/'
+    type: annotation
+    prefix: /{_locale}
+    requirements:
+        _locale: '%app_locales%'
+    defaults:
+        _locale: '%locale%'

app/config/routes/dev/framework.yaml

@@ -0,0 +1,3 @@
+_errors:
+    resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
+    prefix: /_error

app/config/routes/dev/web_profiler.yaml

@@ -0,0 +1,7 @@
+web_profiler_wdt:
+    resource: '@WebProfilerBundle/Resources/config/routing/wdt.xml'
+    prefix: /_wdt
+
+web_profiler_profiler:
+    resource: '@WebProfilerBundle/Resources/config/routing/profiler.xml'
+    prefix: /_profiler