[plasma-mobile] add environment file

overlays/plasma-mobile/etc/environment

+#
+# This file is parsed by pam_env module
+#
+# Syntax: simple "KEY=VAL" pairs on separate lines
+#
+#QT_QUICK_BACKEND=software
+$(dbus-launch)
+QT_QPA_PLATFORM=wayland
+QT_QPA_PLATFORMTHEME=KDE
+QT_WAYLAND_DISABLE_WINDOWDECORATION=1
+XDG_CURRENT_DESKTOP=KDE
+KSCREEN_BACKEND=QScreen
+EGL_PLATFORM=wayland
+
+KDE_FULL_SESSION=1
+KDE_SESSION_VERSION=5
+PLASMA_PLATFORM=phone
+QT_QUICK_CONTROLS_STYLE=Plasma
+QT_ENABLE_GLYPH_CACHE_WORKAROUND=1
+QT_QUICK_CONTROLS_MOBILE=true
+