Add Symfony Deprecation Contracts package

- Created CHANGELOG.md to maintain version history.
- Added README.md with usage instructions for the trigger_deprecation() function.
- Initialized composer.json for the Symfony Deprecation Contracts library, specifying dependencies and autoloading.

modules/pshowsso/deps/ircmaxell/security-lib/phpunit.xml.dist

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="true"
+         backupStaticAttributes="false"
+         bootstrap="test/bootstrap.php"
+         colors="false"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         forceCoversAnnotation="false"
+         mapTestClassNameToCoveredClassName="false"
+         processIsolation="false"
+         stopOnError="false"
+         stopOnFailure="false"
+         stopOnIncomplete="false"
+         stopOnSkipped="false"
+         testSuiteLoaderClass="PHPUnit_Runner_StandardTestSuiteLoader"
+         strict="false"
+         verbose="false">
+    <testsuites>
+        <testsuite name="Unit">
+            <directory>test/Unit</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">lib/</directory>
+        </whitelist>
+    </filter>
+</phpunit>