Added readme

Author: Nyholm

README.md

@@ -0,0 +1,10 @@
+# Symfony application
+
+This is just a plain symfony application created with the Symfony CLI
+
+```
+symfony new symfony-application --version 4.4 --full
+```
+
+It is used in the Symfony-docs CI job where we test code block. A code block is
+added in this application and we will see if it gives any error messages.