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You can create WP app not just from XAML but also from Java script and HTML 5 using Cordova/Phone Gap. You may follow below links to start with.
http://www.c-sharpcorner.com/UploadFile/020f8f/windows-phone-8-app-development-using-phonegap-cordova-par/
If you have WP10 you can also develop UWP app that can be run in multiple platforms i.e. Phone/Tablet and Desktop. Below links will give good idea about it.
https://blogs.msdn.microsoft.com/visualstudio/2015/07/29/targeting-windows-10-with-your-apache-cordova-app/
https://blogs.msdn.microsoft.com/visualstudio/2015/04/30/introducing-the-windows-10-apache-cordova-platform/
If you are using Old VS, you may get latest VS-2015 for free from below.
https://www.visualstudio.com/en-us/products/visual-studio-community-vs.aspx
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