Add Common XML Extensions

package.json

@@ -183,6 +183,16 @@
             }
         ],
         "languages": [
+            {
+                "id": "xml",
+                "extensions": [
+                    ".config",
+                    ".csproj",
+                    ".xml",
+                    ".xsd",
+                    ".xsl"
+                ]
+            },
             {
                 "id": "xquery",
                 "aliases": [
@@ -257,4 +267,4 @@
         "xpath": "0.0.27",
         "xqlint": "^0.4.1"
     }
-}
+}