Adding Entity guides, flowcharts, better sample system. (#2054)

* initial

* Interaction glossary entry

* Sharded Interaction sample

* Renames into solution

* Debugging samples

* Modify target location for webhookclient

* Finalizing docs work, resolving docfx errors.

* Adding threaduser to user chart

* Add branch info to readme.

* Edits to user chart

* Resolve format for glossary entries

* Patch sln target

* Issue with file naming fixed

* Patch 1/x for builds

* Appending suggestions

docs/guides/entities/samples/safety-cast-pass.cs

@@ -0,0 +1,10 @@
+private void MyFunction(IMessage message)
+{
+    // Here we do the reverse as in the previous examples, and let it continue the code below if it IS an IUserMessage
+    if (message is not IUserMessage userMessage)
+        return;
+
+    // Because we do the above check inline (don't give the statement a body),
+    // the code will still declare `userMessage` as available outside of the above statement.
+    Console.WriteLine(userMessage.Author);
+}