introduces composer package structure

.gitattributes

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+* eol=lf
+

.gitignore

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+/vendor/

composer.json

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+{
+    "name": "thedevstack/php-xmpp",
+    "description": "small php library to use XMPP",
+    "type": "library",
+    "autoload": {
+        "psr-4": {
+            "Thedevstack\\PhpXmpp\\": "src/"
+        }
+    },
+    "authors": [
+        {
+            "name": "steckbrief",
+            "email": "steckbrief@chefmail.de"
+        }
+    ],
+    "require": {}
+}