Improve the documentation for custom components

[tjvantoll]

The documentation on custom components (see http://docs.nativescript.org/ui/ui-with-xml#custom-components) should be expanded as it’s a common source of questions and confusion.

I think the biggest thing the docs could use is a tree structure that made it very clear what the expected folder structure is and how the files are named. That information is in the docs now, but it’s not easy to skim and see where to put things at a glance.

[markosko]

@tjvantoll I can help out with this.

[tjvantoll]

@markosko: Awesome! If you run into any problems free to reach out.

[markosko]

For now i am probably ok but i had problem :D when i was trying to get it working before but after i found out what was problem all was good :) but maybe it will need some edit after me i am not that good english

[tjvantoll]

Sounds good 😄 . I’m happy to help edit grammar so no worries there.

[markosko]

Cause this was quite problem for me not info how to set this up in docs :D