Improve readme around referencing saved APL Docs

[stevenpears-bjss]

The documentation around linked documents could be clearer. Please add an example screenshot of the multimodal section of the console so the link to the document is more obvious.

[jallwork]

This may help. Create your design in dev console using Multimodal > Visual etc. Save the design (remember the name - I used perkinimage). REBUILD your model.
Here's some C# code (thanks to the blog below too)
// https://githubmemory.com/repo/BotBuilderCommunity/botbuilder-community-dotnet/issues/380
var propsDic = new Dictionary<string, object>();
propsDic.Add("imageText", "Perkin as a kitten");
propsDic.Add("imageSource","https://yourImageURL.jpg");
var dic = new Dictionary<string, object>();
dic.Add("type", "object");
dic.Add("objectId", "perkinImageID");
dic.Add("helloWorld", "example");
dic.Add("properties", propsDic);
var dataSource = new Dictionary<string, APLDataSource>();
dataSource.Add("data", new Alexa.NET.APL.DataSources.KeyValueDataSource()
{
Properties = dic
});
var directive = new RenderDocumentDirective()
{
Token = "helloworldToken",
Document = new APLDocumentLink()
{
Source = "doc://alexa/apl/documents/perkinimage"
},
DataSources = dataSource
};

                    response.Response.Directives.Add(directive);

Hope it helps