Readd composer.json because it was deleted accidentally

Author: DavidPatzke

composer.json

@@ -0,0 +1,13 @@
+{	
+    "name": "mapbender/documentation",	
+    "description": "Mapbender documentation",	
+    "keywords": ["mapbender", "documentation"],	
+    "type": "library",	
+    "license": "MIT",	
+    "authors": [	
+        {	
+            "name": "Astrid Emde"	
+        }	
+    ]	
+   
+}