Create Symfony Flex recipie

[henrym2]

Expected Behavior

When a symfony bundle is required using composer, a flex recipie should run adding the appropriate config, wiring and other install paramters. These recipies could be stored on the symfony flex contributors repo, to begin with before perhaps being moved to a more permenant location

Actual Behavior

No flex recipie exists for the current repo leading to the bug as found in #11

Steps to Reproduce the Problem

1. Research Symfony Flex recipies
2. Create dummy config files for copying
3. Create Flex Manifest file
4. Create PR into flex repo
5. Test recipie works on blank project