feat: Add Get-Calendar command and Debug harnesses

- add Get-Calendar command
- add initial debug harness for local debug

Harness/Harness.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <LangVersion>latestmajor</LangVersion>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\ModuleCore\ModuleCore.csproj" />
+    </ItemGroup>
+
+</Project>

Harness/Program.cs

@@ -0,0 +1,20 @@
+using System.Text;
+using ModuleCore.Calendar;
+
+namespace Harness;
+
+class Program
+{
+	static void Main(string[] args)
+	{
+		Console.OutputEncoding = Encoding.Unicode;
+		var a = new Calendar();
+		var lastMonth = a.RenderCalendar(DateTime.Now.AddMonths(-1));
+		var now = a.RenderCalendar(DateTime.Now);
+		var august = a.RenderCalendar(DateTime.Now.AddMonths(1));
+
+		Console.Write(lastMonth);
+		Console.Write(now);
+		Console.Write(august);
+	}
+}