Add BudgetApp.io (#802)

* Add BudgetApp.io

* Removed extra bracket after Demo link

README.md

@@ -712,6 +712,7 @@ See also <https://en.wikipedia.org/wiki/List_of_streaming_media_systems>, <https
 See also https://github.com/n1trux/awesome-sysadmin#it-asset-management
 
   * [Benedetto](https://github.com/arecker/bennedetto) - Bennedetto is a simple, turn-based budget management app. `GPLv3` `Python`
+  * [Budget App](https://www.budgetapp.io/) - Budget App is an open source personal budgeting application. ([Demo](https://demo.budgetapp.io/), [Source Code](https://github.com/paukiatwee/budgetapp)) `Apache` `Java`
   * [Dot Ledger](https://www.dotledger.com/) - A web-based personal finance management tool. ([Demo](https://demo.dotledger.com/), [Source Code](https://github.com/dotledger/dotledger)) `Apache` `Ruby`
   * [Economizzer](http://www.economizzer.org/) - Economizzer is a simple and open source personal finance manager system, available in English, Brazilian, Portuguese and Russian. ([Source Code](https://github.com/gugoan/economizzer)) `MIT` `PHP`
   * [ExMoney](https://github.com/gaynetdinov/ex_money) - A [work-in-progress] self-hosted personal finance app. `ISC` `Elixir`