add jetbrains

README.md

@@ -134,3 +134,6 @@ Select this run configuration and click run button to load it.
 
 For more details, please visit: [CONTRIBUTING](https://github.com/xmake-io/xmake-idea/blob/master/CONTRIBUTING.md)
 
+## Powered by
+
+[![JetBrains logo.](https://resources.jetbrains.com/storage/products/company/brand/logos/jetbrains.svg)](https://jb.gg/OpenSource)