Add client-side Notes page with API integration and shared contracts

Freman.Sample.Web.Contracts/CreateNoteRequest.cs

@@ -0,0 +1,10 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Freman.Sample.Web.Contracts;
+
+public sealed class CreateNoteRequest
+{
+    [Required]
+    [StringLength(500)]
+    public string Text { get; set; } = "";
+}

Freman.Sample.Web.Contracts/Freman.Sample.Web.Contracts.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

Freman.Sample.Web.Contracts/NoteDto.cs

@@ -0,0 +1,3 @@
+namespace Freman.Sample.Web.Contracts;
+
+public sealed record NoteDto(int Id, string Text, DateTime CreatedUtc);