Add abp.message.prompt method with warning

Introduces abp.message.prompt to display a browser prompt and invoke a callback with the result. Logs a warning indicating the method is not fully implemented.

npm/packs/core/src/abp.js

@@ -340,6 +340,17 @@ var abp = abp || {};
         callback && callback(result);
     };
 
+    abp.message.prompt = function (message, titleOrOptionsOrCallback, callback) {
+        abp.log.warn('abp.message.prompt is not properly implemented!');
+
+        if (titleOrOptionsOrCallback && !(typeof titleOrOptionsOrCallback == 'string')) {
+            callback = titleOrOptionsOrCallback;
+        }
+
+        var result = prompt(message);
+        callback && callback(result);
+    };
+
     /* UI *******************************************************/
 
     abp.ui = abp.ui || {};