Implemented QML skeleton for the application

qml/Screens/AkbMonitorScreen.qml

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+import QtQuick 2.12
+import QtQuick.Layouts 1.12
+
+import Controls 1.0 as Controls
+
+Item {
+    ColumnLayout {
+        anchors.fill: parent
+
+        Controls.Frame {
+            Layout.fillWidth: true
+
+            RowLayout {
+                anchors.fill: parent
+
+                Controls.TitleLabel {
+                    text: qsTr("Serial number")
+                    Layout.fillWidth: true
+                }
+
+                Controls.TextField {
+                    text: "AABBCCDD"
+                    Layout.fillWidth: true
+                }
+            }
+        }
+
+        Controls.Frame {
+            Layout.fillWidth: true
+
+            GridLayout {
+                columns: 2
+                anchors.fill: parent
+
+                RowLayout {
+                    Controls.ContentLabel {
+                        text: qsTr("Battery charge level, V")
+                    }
+
+                    Controls.DotSeparator {
+                        Layout.fillWidth: true
+                    }
+
+                    Controls.SubtitleLabel {
+                        text: "-"
+                    }
+
+                    Layout.fillWidth: true
+                }
+
+                RowLayout {
+                    Controls.ContentLabel {
+                        text: qsTr("Number of modules")
+                    }
+
+                    Controls.DotSeparator {
+                        Layout.fillWidth: true
+                    }
+
+                    Controls.SubtitleLabel {
+                        text: "-"
+                    }
+
+                    Layout.fillWidth: true
+                }
+
+                RowLayout {
+                    Controls.ContentLabel {
+                        text: qsTr("Battery voltage, V")
+                    }
+
+                    Controls.DotSeparator {
+                        Layout.fillWidth: true
+                    }
+
+                    Controls.SubtitleLabel {
+                        text: "-"
+                    }
+
+                    Layout.fillWidth: true
+                }
+
+                RowLayout {
+                    Controls.ContentLabel {
+                        text: qsTr("Number of cells")
+                    }
+
+                    Controls.DotSeparator {
+                        Layout.fillWidth: true
+                    }
+
+                    Controls.SubtitleLabel {
+                        text: "-"
+                    }
+
+                    Layout.fillWidth: true
+                }
+            }
+        }
+
+        Item {
+            Layout.fillHeight: true
+        }
+    }
+}

qml/Screens/CellMonitorScreen.qml

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+import QtQuick 2.0
+
+Item {
+
+}

qml/Screens/ConnectionScreen.qml

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+import QtQuick 2.12
+import QtQuick.Controls 2.12
+import QtQuick.Dialogs 1.2
+import QtQuick.Layouts 1.12
+
+import Controls 1.0 as Controls
+import Cubo 1.0
+import Utils 1.0
+
+Dialog {
+    id: root
+    title: qsTr("Connection Screen")
+    width: 300
+    height: 300
+    standardButtons: Dialog.NoButton
+
+    contentItem: Rectangle {
+        color: Palette.screenBackgroundColor
+
+        ColumnLayout {
+            anchors.fill: parent
+            anchors.margins: 45
+
+            Label {
+                text: qsTr("Select serial port")
+                Layout.fillWidth: true
+                Layout.alignment: Qt.AlignHCenter | Qt.AlignBottom
+            }
+
+            Controls.ComboBox {
+                id: serialBox
+                model: BmsInterface.serialPortNames()
+                Layout.fillWidth: true
+                Layout.alignment: Qt.AlignCenter
+            }
+
+            Controls.AlternativeButton {
+                text: qsTr("Connect")
+                Layout.fillWidth: true
+                Layout.alignment: Qt.AlignHCenter | Qt.AlignTop
+                onClicked: {
+                    var currentPort = BmsInterface.serialPortNames()[serialBox.currentIndex]
+                    if (BmsInterface.connectSerial(currentPort))
+                        root.close()
+                }
+            }
+        }
+    }
+}

qml/Screens/qmldir

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+module Screens
+ConnectionScreen 1.0 ConnectionScreen.qml
+AkbMonitorScreen 1.0 AkbMonitorScreen.qml
+CellMonitorScreen 1.0 CellMonitorScreen.qml