Created Import/Export page (stub)

Changed some dependency properties from Interfaces to implementations
Used CanExecute on Commands

ModernKeePass/Views/MainPageFrames/ImportExportPage.xaml

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+<Page
+    x:Class="ModernKeePass.Views.ImportExportPage"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    mc:Ignorable="d">
+
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="100" />
+            <ColumnDefinition Width="200" />
+            <ColumnDefinition Width="200" />
+            <ColumnDefinition />
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <TextBlock Text="Import" Style="{StaticResource SubheaderTextBlockStyle}" />
+        <HyperlinkButton Grid.Column="0" Grid.Row="1" Content="Select file..." Style="{StaticResource MainColorHyperlinkButton}" Click="ImportFileButton_OnClick" />
+        <StackPanel Grid.Column="1" Grid.Row="1" >
+            <TextBlock Text="Format" Style="{StaticResource BodyTextBlockStyle}" Margin="0,0,0,10" />
+            <ComboBox Style="{StaticResource MainColorComboBox}" />
+        </StackPanel>
+        <StackPanel Grid.Column="2" Grid.Row="1" >
+            <TextBlock Text="Import into..." Style="{StaticResource BodyTextBlockStyle}" Margin="0,0,0,10" />
+            <RadioButton GroupName="ImportDestination" Content="New database" />
+            <RadioButton GroupName="ImportDestination" Content="Currently opened database" />
+        </StackPanel>
+        <Button Grid.Column="3" Grid.Row="1" Content="Import" Style="{StaticResource MainColorButton}" />
+    </Grid>
+</Page>

ModernKeePass/Views/MainPageFrames/ImportExportPage.xaml.cs

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+using System;
+using Windows.Storage.Pickers;
+using Windows.UI.Xaml;
+
+// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
+
+namespace ModernKeePass.Views
+{
+    /// <summary>
+    /// The import/export page.
+    /// </summary>
+    public sealed partial class ImportExportPage
+    {
+        public ImportExportPage()
+        {
+            InitializeComponent();
+        }
+
+        private async void ImportFileButton_OnClick(object sender, RoutedEventArgs e)
+        {
+            var picker =
+                new FileOpenPicker
+                {
+                    ViewMode = PickerViewMode.List,
+                    SuggestedStartLocation = PickerLocationId.DocumentsLibrary
+                };
+            picker.FileTypeFilter.Add(".csv");
+
+            // Application now has read/write access to the picked file
+            var file = await picker.PickSingleFileAsync();
+            if (file == null) return;
+            
+        }
+    }
+}