Expand XML docs across bridge and test code

tests/ZB.MOM.WW.LmxOpcUa.Tests/SampleTest.cs

@@ -3,8 +3,14 @@ using Xunit;
 
 namespace ZB.MOM.WW.LmxOpcUa.Tests
 {
+    /// <summary>
+    /// Placeholder unit test that keeps the unit test project wired into the solution.
+    /// </summary>
     public class SampleTest
     {
+        /// <summary>
+        /// Confirms that the unit test assembly is executing.
+        /// </summary>
         [Fact]
         public void Placeholder_ShouldPass()
         {