GCI535[doc]: add examples, limitations and ideas for the next developments

Author: Fabien Bézagu

eslint-plugin/docs/rules/no-imported-number-format-library.md

@@ -21,18 +21,34 @@ Depending on less external dependencies also increases the maintainability and s
 `format` method.**
 
 ```js
-// Example with numbro
+// Example with numbro (not compliant)
 import numbro from "numbro";
 
 numbro.setLanguage('en-GB');
 var string = numbro(1000).format({
   thousandSeparated: true,
 }); // '1,000'
 
-// Example with Intl
+// Example with numerable (not compliant)
+import { format } from "numerable";
+format(1000, '0,0');
+
+// Example with Intl (compliant)
 new Intl.NumberFormat("en-GB").format(1000); // '1,000'
 ```
 
+## Limitations
+As for now, only two libraries are handled by this rule :
+- [numbro](https://numbrojs.com/)
+- [numerable](https://numerablejs.com/lander)
+
+Some candidates for the future developments are :
+- [javascript-number-formatter](https://github.com/Mottie/javascript-number-formatter)
+- [numeraljs](https://www.npmjs.com/package/numerable)
+- [formatjs](https://formatjs.github.io/)
+
+It’s more likely this rule won’t ever be exhaustive. 
+
 ## Resources
 
 ### Documentation