Add config as text extension (#110)

Author: JanKrivanek

src/EmptyFiles/FileExtensions.cs

@@ -130,6 +130,7 @@ public static void AddTextExtensions(IEnumerable<string> extensions)
         "coffee",
         "coffeekup",
         "conf",
+        "config",
         "cp",
         "cpp",
         "cpt",
@@ -414,4 +415,4 @@ public static void AddTextExtensions(IEnumerable<string> extensions)
     };
 
     public static IEnumerable<string> TextExtensions => textExtensions;
-}
+}