Add .qmlproject file for examples containing .ui.qml files

If an example contains ui.qml it should also have
a .qmlproject file for Qt Design Studio.

Pick-to: 6.2
Change-Id: I290838f5bf7c6d295ea7fecb6b1c689ad5b924e1
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

examples/quickcontrols2/flatstyle/flatstyle.qmlproject

@@ -0,0 +1,45 @@
+import QmlProject
+
+Project {
+    mainFile: "flatstyle.qml"
+
+    /* Include .qml, .js, and image files from current directory and subdirectories */
+    QmlFiles {
+        directory: "."
+    }
+
+    JavaScriptFiles {
+        directory: "."
+    }
+
+    ImageFiles {
+        directory: "."
+    }
+
+    Files {
+        filter: "*.conf"
+        files: ["qtquickcontrols2.conf"]
+    }
+
+    Files {
+        filter: "qmldir"
+        directory: "."
+    }
+
+    Files {
+        filter: "*.ttf;*.otf"
+    }
+
+    Environment {
+        QT_QUICK_CONTROLS_CONF: "qtquickcontrols2.conf"
+        QT_AUTO_SCREEN_SCALE_FACTOR: "1"
+    }
+
+    qt6Project: true
+
+    /* List of plugin directories passed to QML runtime */
+    importPaths: [ ".", "imports" ]
+
+    /* Required for deployment */
+    targetDirectory: "/opt/flatstyle"
+}