added release pipeline

Author: kerryjiang

.github/workflows/myget_release.yaml

@@ -0,0 +1,19 @@
+name: myget-release
+on: [workflow_dispatch]
+jobs:
+    push:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v1
+            - name: Setup .NET Core
+              uses: actions/setup-dotnet@v1
+              with:
+                dotnet-version: 7.0.201
+            - name: Set env
+              run: echo "DOTNET_CLI_TELEMETRY_OPTOUT=1" >> $GITHUB_ENV
+            - uses: dotnet/nbgv@master
+              id: nbgv
+            - name: Pack
+              run: dotnet pack -c Release -p:PackageVersion=${{ steps.nbgv.outputs.NuGetPackageVersion }} -p:Version=${{ steps.nbgv.outputs.NuGetPackageVersion }}.${{ github.run_number }} -p:AssemblyVersion=${{ steps.nbgv.outputs.AssemblyVersion }} -p:AssemblyFileVersion=${{ steps.nbgv.outputs.AssemblyFileVersion }} -p:AssemblyInformationalVersion=${{ steps.nbgv.outputs.AssemblyInformationalVersion }} /p:NoPackageAnalysis=true
+            - name: Push
+              run: dotnet nuget push **/*.nupkg --api-key ${{ secrets.MYGET_API_KEY }} --source https://www.myget.org/F/scisharp/api/v3/index.json