improve ext

vscode/syntaxes/riverdelta.tmLanguage.json

@@ -7,14 +7,19 @@
     },
     {
       "include": "#strings"
+    },
+    {
+      "include": "#lineComment"
     }
   ],
   "repository": {
     "keywords": {
-			"patterns": [{
+      "patterns": [
+        {
           "name": "keyword.control.riverdelta",
           "match": "\\b(function|let|if|then|else|type|loop|break|import|extern|mod|global)\\b"
-			}]
+        }
+      ]
     },
     "strings": {
       "name": "string.quoted.double.riverdelta",
@@ -26,6 +31,14 @@
           "match": "\\\\."
         }
       ]
+    },
+    "lineComment": {
+      "patterns": [
+        {
+          "name": "comment.riverdelta",
+          "match": "//.*"
+        }
+      ]
     }
   },
   "scopeName": "source.nil"