Add XML examples

[Bip901]

Hi! I'm new to this repo.

I've managed to find this example by searching through old issues, but some official examples of how the XML should look like would be highly appreciated!

[softlion]

you can generate the xml from whatever bluez service you want from linux.

For example:

busctl list
busctl tree org.bluez

busctl introspect org.bluez /org/bluez/hci0 --xml-interface

Then put that xml file into some folder of your project (dbus/org.bluez.xml in the below example), then modify your csproj:

    <ItemGroup>
      <PackageReference Include="Tmds.DBus.Protocol" Version="0.16.0" />
      <PackageReference Include="Tmds.DBus.SourceGenerator" Version="0.0.15" PrivateAssets="All">
        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      </PackageReference>
    </ItemGroup>

    <ItemGroup>
      <AdditionalFiles Include="dbus/org.bluez.xml" DBusGeneratorMode="Proxy" />
    </ItemGroup>

Result:

DBusGeneratorMode affects the generated classes:

• Proxy: generated classes are public
• Handler: generated classes are internal abstract

[Bip901]

Cool! Consider including this generation command in the README.