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/paragonie/random-lib/composer.json

@@ -0,0 +1,41 @@
+{
+    "name": "paragonie/random-lib",
+    "type": "library",
+    "description": "A Library For Generating Secure Random Numbers",
+    "keywords": ["random", "random-numbers", "random-strings", "cryptography"],
+    "homepage": "https://github.com/ircmaxell/RandomLib",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Paragon Initiative Enterprises",
+            "email": "security@paragonie.com",
+            "homepage": "https://paragonie.com"
+        },
+        {
+            "name": "Anthony Ferrara",
+            "email": "ircmaxell@ircmaxell.com",
+            "homepage": "http://blog.ircmaxell.com"
+        }
+    ],
+    "require-dev": {
+        "mikey179/vfsstream": "^1.6",
+        "friendsofphp/php-cs-fixer": "^1.11",
+        "phpunit/phpunit": "^4.8 || >=5.0.0 <5.4"
+    },
+    "require": {
+        "ircmaxell/security-lib": "^1.1",
+        "paragonie/random_compat": "^2|~9.99",
+        "paragonie/sodium_compat": "^1|^2",
+        "php": ">=5.3.2"
+    },
+    "autoload": {
+        "psr-0": {
+            "RandomLib":   "lib"
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master":  "2.1.x-dev"
+        }
+    }
+}