convert to use service

Services/FileNoteService.cs

@@ -0,0 +1,28 @@
+namespace BinaryDad.Notes.Services
+{
+    public class FileNoteService : INoteService
+    {
+        private readonly string? filePath;
+
+        public FileNoteService(IConfiguration configuration)
+        {
+            filePath = configuration["ContentFilePath"];
+
+            // ensure initialized
+            if (!File.Exists(filePath))
+            {
+                File.WriteAllText(filePath, "Hi! Feel free to start typing. Everything will be saved soon after you are done typing.");
+            }
+        }
+
+        public string Get()
+        {
+            return File.ReadAllText(filePath);
+        }
+
+        public void Save(string content)
+        {
+            File.WriteAllText(filePath, content);
+        }
+    }
+}

Services/INoteService.cs

@@ -0,0 +1,8 @@
+namespace BinaryDad.Notes.Services
+{
+    public interface INoteService
+    {
+        string Get();
+        void Save(string content);
+    }
+}