fgm/php__symfony__book: FGM's version of the code suggested in the SF4 book.

Frederic G. MARAND d230f127f7 Ch. 4: Using session data.		6 lat temu
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dev	deeb7894a7 Ch. 2: profiler, twig.	6 lat temu
test	deeb7894a7 Ch. 2: profiler, twig.	6 lat temu
framework.yaml	d230f127f7 Ch. 4: Using session data.	6 lat temu
routing.yaml	f8830b8a47 Initial commit: generated skeleton + composer require server.	6 lat temu
twig.yaml	deeb7894a7 Ch. 2: profiler, twig.	6 lat temu