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/league/oauth2-facebook/composer.json

@@ -0,0 +1,40 @@
+{
+    "name": "league/oauth2-facebook",
+    "description": "Facebook OAuth 2.0 Client Provider for The PHP League OAuth2-Client",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Sammy Kaye Powers",
+            "email": "me@sammyk.me",
+            "homepage": "http://www.sammyk.me"
+        }
+    ],
+    "keywords": [
+        "oauth",
+        "oauth2",
+        "client",
+        "authorization",
+        "authentication",
+        "facebook"
+    ],
+    "require": {
+        "php": ">=7.3",
+        "league/oauth2-client": "^2.0"
+    },
+    "require-dev": {
+        "ext-json": "*",
+        "phpunit/phpunit": "^9.4",
+        "mockery/mockery": "~1.3.0",
+        "squizlabs/php_codesniffer": "~3.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "League\\OAuth2\\Client\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "League\\OAuth2\\Client\\Test\\": "tests/src/"
+        }
+    }
+}