manual routing support

[jlooper]

I think this template would benefit from adding a solid strategy for manual routing. We get a lot of questions on 'how to' on Slack, maybe a good sample would help clarify.

[hgc2002]

Check this https://github.com/nativescript-vue/nativescript-vue-navigator
Also https://market.nativescript.org/plugins/nativescript-vue-router-ns

This is totally outdated: https://github.com/nativescript-vue/nativescript-vue-router