Add support for the Italian SPID specifications

Name		Name	Last commit message	Last commit date
Latest commit History 146 Commits
.github		.github
src/SPID/XML/saml		src/SPID/XML/saml
tests		tests
tools/linters		tools/linters
.gitattributes		.gitattributes
.gitignore		.gitignore
.markdownlint.yml		.markdownlint.yml
.markdownlintignore		.markdownlintignore
.markdownlintrc		.markdownlintrc
.php_cs.dist		.php_cs.dist
LICENSE		LICENSE
README.md		README.md
codecov.yml		codecov.yml
composer.json		composer.json
phpcs.xml		phpcs.xml
phpstan-dev.neon		phpstan-dev.neon
phpstan.neon		phpstan.neon
phpunit.xml		phpunit.xml

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