I am sure you know what is coming next:

I have just bought a Microsoft Lumia 950XL and realised I cannot play the game on it! Is there any plans to create an app for Microsoft Windows phones?

It's been discussed, and because they don't sell very well (phones) no.

"not on my immediate roadmap"

Im having a note 5 and the app has sone issues

The maps do not show itself at full in normal screen
i have to eblarge a map to see the bonuses and map colours

Yeah the mobile app is a little out of date, so I wouldn't be surprised if there is a new update for it this year.

I have a Nokia Lumia 1020 and I regret everyday getting a windows phone. The app store is just crap and the touch screen is buggy.

See, where you went wrong was when you bought a windows phone...

people have asked for it a few times already:
https://warlight.uservoice.com/forums/77051-warlight-features/suggestions/1067509-windows-phone-client

i don't really see the need for it anymore. windows phone market never pulled through and microsoft itself seems to be abandoning it. people who want to use their phones and tablets also for gaming buy android or apple, not microsoft.