message: Added demo tests.
diff: <Compile Include="Wrapper\AnonCredsTests\IssuerCreateClaimTest.cs" />
  <Compile Include="Wrapper\AnonCredsTests\IssuerCreateAndStoreClaimDefinitionTest.cs" />
  <Compile Include="Wrapper\AnonCredsTests\AnonCredsIntegrationTestBase.cs" />
  + <Compile Include="Wrapper\DemoTests\SignusDemoTest.cs" />
  + <Compile Include="Wrapper\DemoTests\LedgerDemoTest.cs" />
  + <Compile Include="Wrapper\DemoTests\AnonCredsDemoTest.cs" />
  + <Compile Include="Wrapper\DemoTests\AgentDemoTest.cs" />
  <Compile Include="Wrapper\LedgerTests\SchemaRequestTest.cs" />
  <Compile Include="Wrapper\LedgerTests\RequestTest.cs" />
  <Compile Include="Wrapper\LedgerTests\NymRequestTest.cs" />
  