feat: Add Get-Calendar command and Debug harnesses

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

PowershellModule/build/build.ps1

@@ -0,0 +1,48 @@
+param (
+    [switch] $release
+)
+
+$wdir = $PSScriptRoot
+$module = "PowershellModule"
+$output = "$wdir/$module"
+
+if (Test-Path $output)
+{
+   Remove-Item $output -Recurse
+}
+
+New-Item $output -ItemType Directory
+
+# copy the built dlls to this directory
+if($release){
+    # For release we'll get a bunch of dependencies that we honestly do not need.
+    # This module is built to run assuming the dotnet 10 runtime exists, and powershell is 7.6 or higher,
+    # because of this we really don't need the system.* dlls that come with the publish, or the random ass
+    # newtonsoft.json.dll that comes from ???? publish fucking sucks for libraries even with framework-dependent
+    # selected as the publish option
+    Copy-Item -Path "$( $wdir )\..\bin\Release\net10.0\publish\$module.dll" -Destination $output
+    Copy-Item -Path "$( $wdir )\..\bin\Release\net10.0\publish\ModuleCore.dll" -Destination $output
+} else
+{
+    Copy-Item -Path "$( $wdir )\..\bin\Debug\net10.0\*.dll" -Destination $output
+}
+#Copy-Item -Path "$( $wdir )\..\bin\Debug\netstandard2.1\*.dll" -Destination $output
+
+$manifestSplat = @{
+    Path = "$output/$module.psd1"
+    Author = 'Me'
+    # technically we only need the base module here and it'll locate any dlls it needs
+    NestedModules = @("$module.dll")#(Get-ChildItem "$output/*.dll" | Select-Object { $_.Name } -ExpandProperty Name)
+    RootModule = "$module.psm1"
+#    FunctionsToExport = @('Get-Calendar')
+    CmdletsToExport = @('Get-Calendar')
+    # These should all be empty arrays - otherwise they default to wildcard which the generated psd1 will helpfully
+    # tell you not to do for performance reasons, as the fallback if these are left out is to use wildcard...
+    FunctionsToExport = @()
+    VariablesToExport = @()
+    AliasesToExport = @()
+}
+
+New-ModuleManifest @manifestSplat
+# We don't actually need content here, it's just so PowerShell has an entry point
+New-Item "$output/$module.psm1" -ItemType File