Add XML comments

Author: MaggieKimani1

src/Microsoft.OpenApi/Models/OpenApiPaths.cs

@@ -8,7 +8,14 @@ namespace Microsoft.OpenApi.Models
     /// </summary>
     public class OpenApiPaths : OpenApiExtensibleDictionary<OpenApiPathItem>
     {
+        /// <summary>
+        /// Parameterless constructor
+        /// </summary>
         public OpenApiPaths() {}
+
+        /// <summary>
+        /// Initializes a copy of <see cref="OpenApiPaths"/> object
+        /// </summary>
         public OpenApiPaths(OpenApiPaths paths) {}
 
     }

src/Microsoft.OpenApi/Models/OpenApiResponses.cs

@@ -8,8 +8,14 @@ namespace Microsoft.OpenApi.Models
     /// </summary>
     public class OpenApiResponses : OpenApiExtensibleDictionary<OpenApiResponse>
     {
+        /// <summary>
+        /// Parameterless constructor
+        /// </summary>
         public OpenApiResponses() { }
 
+        /// <summary>
+        /// Initializes a copy of <see cref="OpenApiResponses"/> object
+        /// </summary>
         public OpenApiResponses(OpenApiResponses openApiResponses) { }
 
     }

src/Microsoft.OpenApi/Models/RuntimeExpressionAnyWrapper.cs

@@ -16,8 +16,14 @@ public class RuntimeExpressionAnyWrapper : IOpenApiElement
         private IOpenApiAny _any;
         private RuntimeExpression _expression;
 
+        /// <summary>
+        /// Parameterless constructor
+        /// </summary>
         public RuntimeExpressionAnyWrapper() {}
 
+        /// <summary>
+        /// Initializes a copy of an <see cref="RuntimeExpressionAnyWrapper"/> object
+        /// </summary>
         public RuntimeExpressionAnyWrapper(RuntimeExpressionAnyWrapper runtimeExpressionAnyWrapper)
         {
             Any = runtimeExpressionAnyWrapper.Any;

src/Microsoft.OpenApi/Services/OpenApiWorkspace.cs

@@ -63,6 +63,9 @@ public OpenApiWorkspace()
             BaseUrl = new Uri("file://" + Environment.CurrentDirectory + "\\" );
         }
 
+        /// <summary>
+        /// Initializes a copy of an <see cref="OpenApiWorkspace"/> object
+        /// </summary>
         public OpenApiWorkspace(OpenApiWorkspace workspace){}
 
         /// <summary>