Add ionic to mobile list

[trustyoo86]

What this PR does? Add ionic to mobile list.

Why are you adding given library? (Short description why do you think that this library is important) Ionic is one of mobile framework using Angular ever, but it is support to react and annouce release supporting react recently. Ionic is similar to react-native, but it has some characteristic and difference with react-native.

1. Ionic use standard 'react-dom' system, so It is easy to learn for react developers who web based.
2. Ionic support to PWA(Progressive Web App) basically, so developers using ionic can multiple resource, mobile-web and web app.

Here is annoucing ionic react url, and if it is need to adding png file, I'll add images and pull request again.

Screenshots (the part that you modified is enough)

Before:

After changes: