I need a Mobile app (IOS & Android) for my Drupal 8 website

I have built a complete Drupal 8 website based mainly on below modules:
_ Custom sub-theme of Bartik core theme.
_ Webform
_ Business rules
_ Group
_ Social Auth
_ Footable
_ SMS Framework
_ Field Group
_ and many other contrib modules

I would like to have a mobile app for both android and IOS to communicate with my Drupal 8 website... So users will download my app on their phone and will have the ability to:
_ Login/register accounts
_ View nodes and other views based on permission and roles given to every user.
_ Interacts and submit webforms

Information might be important:
_ I have many views using 'contextual filters' like 'current NID from URL' and 'current UID from URL'.
_ 90% of the website like nodes, views, webform will open in dialogs.
_ 50% of the website uses the 'ajax' drupla 8 core system.

Since I need the application to be ready as soon as possible, I was thinking of building (at first stage) an app which will do nothing other than launching my current website inside a APP CANVAS.
So users will indeed download the app from any app stores and once installed, the mobile app will do nothing but LAUNCHING MY WEBSITE (www.example.com) from inside this app.

Of course later, after launching my project will ask again the developer to create a Hybrid or native app for me.

Please when reacting to my job post, do include:
_ The total price of the basic app (IOS and Android) which will do nothing other than launch my website url from the app canvas.
_ The total price of the Hybrid or Native app (IOS and Android) which will have its own theme and UI and will communicate back and forth with my Drupal 8 website (MySql database)
_ Estimated time for completion.

Thank you.