Add enums to cater for multiple scheme and bearer formats

Author: MaggieKimani1

src/Microsoft.OpenApi/Models/AuthenticationScheme.cs

@@ -0,0 +1,30 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. 
+
+using Microsoft.OpenApi.Attributes;
+
+namespace Microsoft.OpenApi.Models
+{
+    /// <summary>
+    /// The type of HTTP authentication schemes
+    /// </summary>
+    public enum AuthenticationScheme
+    {
+        /// <summary>
+        /// Use basic HTTP authentication schemes
+        /// </summary>
+        [Display("basic")] Basic,
+
+        /// <summary>
+        /// Use bearer Authentication scheme
+        /// </summary>
+        [Display("bearer")] Bearer,
+
+        /// <summary>
+        /// Use OpenIdConnectUrl
+        /// </summary>
+        [Display("openIdConnectUrl")] OpenIdConnectUrl
+
+        
+    }
+}

src/Microsoft.OpenApi/Models/BearerFormat.cs

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. 
+
+using Microsoft.OpenApi.Attributes;
+
+namespace Microsoft.OpenApi.Models
+{
+    /// <summary>
+    /// The type of Bearer authentication scheme
+    /// </summary>
+    public enum BearerFormat
+    {
+        /// <summary>
+        /// Use JWT bearer format
+        /// </summary>
+        [Display("jwt")] JWT,
+
+    }
+}

src/Microsoft.OpenApi/Models/OpenApiSecurityScheme.cs

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license. 
 
 using System;
@@ -39,14 +39,14 @@ public class OpenApiSecurityScheme : IOpenApiSerializable, IOpenApiReferenceable
         /// REQUIRED. The name of the HTTP Authorization scheme to be used
         /// in the Authorization header as defined in RFC7235.
         /// </summary>
-        public string Scheme { get; set; }
+        public AuthenticationScheme Scheme { get; set; }
 
         /// <summary>
         /// A hint to the client to identify how the bearer token is formatted.
         /// Bearer tokens are usually generated by an authorization server,
         /// so this information is primarily for documentation purposes.
         /// </summary>
-        public string BearerFormat { get; set; }
+        public BearerFormat BearerFormat { get; set; }
 
         /// <summary>
         /// REQUIRED. An object containing configuration information for the flow types supported.