First implementation

Qml/Palette/Palette.qml

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+pragma Singleton
+import QtQuick 2.12
+
+QtObject {
+    property color labelTextColor: "#232323"
+    property color descriptionTextColor: "#757575"
+    property color alternativeTextColor: "#FCFCFC"
+
+    property color backgroundColor: "#EEEEEE"
+    property color controlBackgroundColor: "#FCFCFC"
+
+    property color borderColor: "#D0D0D0"
+
+    property color blueButtonColor: "#3069FE"
+    property color greenButtonColor: "#4FBA5A"
+    property color redButtonColor: "#E74245"
+    property color yellowButtonColor: "#F4BB44"
+
+    property color informationColor: "#E2EAFF"
+    property color invalidColor: "#FFEDE3"
+    property color goodColor: "#C4FFCA"
+    property color neutralColor: "#FEFBC6"
+}

Qml/Palette/qmldir

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+module Palette
+singleton Palette 1.0 Palette.qml