Add project files.

Controllers/ApiController.cs

@@ -0,0 +1,31 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace BinaryDad.Notes.Controllers;
+
+[ApiController]
+[Route("[controller]")]
+public class ApiController : ControllerBase
+{
+    private readonly string filePath;
+
+    public ApiController(IConfiguration configuration)
+    {
+        filePath = configuration["ContentFilePath"];
+    }
+
+    [HttpPost]
+    [Route("save")]
+    public async Task<bool> Save()
+    {
+        var content = string.Empty;
+
+        using (var reader = new StreamReader(Request.Body))
+        {
+            content = await reader.ReadToEndAsync();
+        }
+
+        await System.IO.File.WriteAllTextAsync(filePath, content);
+
+        return true;
+    }
+}

Controllers/HomeController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace BinaryDad.Notes.Controllers;
+
+public class HomeController : Controller
+{
+    private readonly string filePath;
+
+    public HomeController(IConfiguration configuration)
+    {
+         filePath = configuration["ContentFilePath"];
+    }
+
+    public IActionResult Index()
+    {
+        var content = System.IO.File.ReadAllText(filePath);
+
+        return View((object)content);
+    }
+}