added two samples

VendorManagement/Vendors.Api/VendorApiExtensions.cs

@@ -0,0 +1,72 @@
+namespace Vendors.Api;
+
+public static class VendorApiExtensions
+{
+    extension(IEndpointRouteBuilder endpoints)
+    {
+        public IEndpointRouteBuilder MapVendorApiEndpoints()
+        {
+            var group = endpoints.MapGroup("/vendors")
+                .WithDescription("Vendor List And Lookup")
+                .WithDisplayName("Vendor List");
+
+            group.MapGet("", GetVendors).WithDisplayName("Vendor List").WithDescription("Get the list of vendors");
+
+            group.MapGet("{id:guid}", GetVendorById)
+                .WithDisplayName("Vendor By Id")
+                .WithDescription("Get a vendor by its unique identifier");
+
+            return endpoints;
+        }
+
+        static async Task<IResult> GetVendors(string? apiKey)
+        {
+            if (apiKey is null)
+            {
+                return TypedResults.BadRequest("API_KEY is required");
+            }
+
+            var lastThree = apiKey.Length >= 3 ? apiKey[^3..] : apiKey;
+            if (!int.TryParse(lastThree, out var delaySeconds))
+            {
+                return TypedResults.BadRequest("API_KEY must end with three digits");
+            }
+
+            await Task.Delay(delaySeconds * 100);
+            var response = new
+            {
+                Note = "This is fake data for a classroom example", Vendors = StaticVendorList.Vendors
+            };
+
+            return TypedResults.Ok(response);
+        }
+
+        static async Task<IResult> GetVendorById(Guid id, string? apiKey)
+        {
+            // get the last three characters of the API key
+            // if they are an integer, delay that many seconds
+            // if they are not return a 400 bad request
+            if (apiKey is null)
+            {
+                return TypedResults.BadRequest("API_KEY is required");
+            }
+
+            var lastThree = apiKey.Length >= 3 ? apiKey[^3..] : apiKey;
+            if (!int.TryParse(lastThree, out var delaySeconds))
+            {
+                return TypedResults.BadRequest("API_KEY must end with three digits");
+            }
+
+            await Task.Delay(delaySeconds * 100);
+
+            var vendor = StaticVendorList.Vendors.FirstOrDefault(v => v.Id == id);
+
+            if (vendor == null)
+            {
+                return TypedResults.NotFound();
+            }
+
+            return TypedResults.Ok(vendor);
+        }
+    }
+}