Adding Dockerfile for UD Community Demo

docker/dockerfile

@@ -0,0 +1,10 @@
+FROM mcr.microsoft.com/powershell:latest
+LABEL description="Based on the Microfot Ubuntu 18.04 for Linux PowerShell Dockerfile that will download and start Universal Dashboard Community on port 8080" 
+
+# FROM: https://hub.docker.com/_/microsoft-powershell
+# Build: docker build . --tag=universaldashboarddemo
+# Run: docker run -it -p 8080:8080 universaldashboarddemo:latest 
+
+EXPOSE 8080
+COPY [ "./startdashboard.ps1", "/home/startdashboard.ps1" ]
+ENTRYPOINT ["pwsh", "/home/startdashboard.ps1"]

docker/startdashboard.ps1

@@ -0,0 +1,14 @@
+Write-Host "Installing Universal Dashboard Community Edition..."
+Install-module  UniversalDashboard.Community -AllowPrerelease -AcceptLicense -Force 
+Import-module UniversalDashboard.Community -Force 
+
+Write-Host "Starting Demo Dashboard..."
+
+Try{
+    Get-UDDashboard | Stop-UDDashboard
+    Start-UDDashboard -Port 8080
+    Read-Host "Universal Dashboard Community Edition is now running!"
+}
+Catch{
+    Write-Host "UniversalDashboard failed to start!"
+}