Add project files.

WinGreedLibrary/DataAccess.cs

@@ -0,0 +1,9 @@
+namespace WpfLibrary;
+
+public class DataAccess : IDataAccess
+{
+    public string GetData()
+    {
+        return "This is the data from the Data Access class!";
+    }
+}

WinGreedLibrary/IDataAccess.cs

@@ -0,0 +1,7 @@
+namespace WpfLibrary
+{
+    public interface IDataAccess
+    {
+        string GetData();
+    }
+}

WinGreedLibrary/WinGreedLib.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>