add script and instructions

PushNuget.ps1

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+# To push new package to proget 
+# 1. in Blazor.Diagrams.csproj and Blazor.Diagrams.Core.csproj increase version number
+# 2. build Blazor.Diagrams - a package will be created and it should include strong named dlls:
+#  Blazor.Diagrams.dll, Blazor.Diagrams.Core.dll, SvgPathProperties.dll
+# 3. change the package path in this script to have the package number from the csproj
+# 4. run the script (remember to put in the correct api key)
+
+pushd $PSScriptRoot
+
+$feedSource = "http://proget.wtg.zone/nuget/WTG-Internal/"
+$apiKey = ""
+$packagePath = "*.nupkg"
+
+function Write-Log {
+    Write-Host "$(get-date -f "yyyy-MM-dd HH:mm:ss.fff")`t$args"
+}
+
+try {
+    $scriptSw = [System.Diagnostics.Stopwatch]::StartNew()
+    & nuget.exe push $packagePath -ApiKey $apiKey -Source $feedSource -Verbosity detailed
+    if (-not $?)
+    {
+        Write-Log "FAILED to deploy: $packagePath)"
+    }
+    else 
+    {
+        Write-Log "Deployed $packagePath )"
+    }
+}
+finally {
+    popd
+    Write-Log "Finished (took: $($scriptSw.Elapsed))"
+} 

WTGPublishPackageGuide.md

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+# Publishing WTG.Z.Blazor.Diagrams for WTG usage
+This doc explains how the package we use at WTG is updated.
+
+When a PR is merged to master, the GitHub Action 'Create release' should run. It can also be run manually if needed. This action creates a GitHub Release and uploads the package to the release. The version number is also handled by the action.
+
+## To push package to proget
+1. **Find the release**. Most likely the most recent release is the one to use. To find all releases, go to the repo main page then click 'Releases'.
+2. **Download the package**. Expand the 'Assets' section of the release and download the *.nupkg file.
+3. **Push to proget**. Modify the PushNuget.ps1 script so that it had the correct path to the downloaded *.nupkg file and the API key. Ask another team member if not sure. Once the script has all required information, run the script to push the package.
+4. **Update package version in WTG**. In Directory.Packages.Props, update the version of WTG.Z.Blazor.Diagrams to match the package that was just uploaded to proget.
+
+