Added appx assets

<?xml version="1.0" encoding="utf-8"?>

<Package

   xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"

   xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"

   xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities">

  <Identity Name="OpenFlexureMicroscopeJS"

    ProcessorArchitecture="x64"

    Publisher="CN=bath-open-instrumentation-group"

    Version="1.0.0.0" />

  <Properties>

    <DisplayName>OpenFlexure Microscope JS</DisplayName>

    <PublisherDisplayName>Bath Open Instrumentation Group</PublisherDisplayName>

    <Description>No description entered</Description>

    <Logo>assets\SampleAppx.50x50.png</Logo>

  </Properties>

  <Resources>

    <Resource Language="en-us" />

  </Resources>

  <Dependencies>

    <TargetDeviceFamily Name="Windows.Desktop" MinVersion="10.0.14316.0" MaxVersionTested="10.0.14316.0" />

  </Dependencies>

  <Capabilities>

    <rescap:Capability Name="runFullTrust"/>

  </Capabilities>

  <Applications>

    <Application Id="OpenFlexureMicroscopeJS" Executable="app/openflexure-microscope-js.exe" EntryPoint="Windows.FullTrustApplication">

      <uap:VisualElements

       BackgroundColor="#9C1561"

       DisplayName="OpenFlexure Microscope JS"

       Square150x150Logo="assets\SampleAppx.150x150.png"

       Square44x44Logo="assets\SampleAppx.44x44.png"

       Description="OpenFlexure Microscope JS for Desktops">

        <uap:DefaultTile Wide310x150Logo="assets\SampleAppx.310x150.png" />

      </uap:VisualElements>

    </Application>

  </Applications>

</Package>