Create skeleton of new libraries with samples

.github/workflows/Fhi.AuthExtensions.CI.yml

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+name: Fhi.HelseId.CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup dotnet
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            8.0.x
+            9.0.x
+
+      - name: Display dotnet version
+        run: dotnet --version
+
+      - name: Restore dependencies
+        run: dotnet restore
+
+      - name: Build
+        run: dotnet build --configuration Release --no-restore --verbosity minimal
+
+      - name: Run tests
+        run: dotnet test --configuration Release --no-build --verbosity normal

.github/workflows/Fhi.AuthExtensions.Nuget.yml

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+name: Fhi.HelseId.Nuget
+
+on:
+  push:
+    branches:
+      - main
+
+defaults:
+  run:
+    shell: pwsh
+
+jobs:
+  publish:
+    name: Build, pack & publish
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup dotnet
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: |
+            8.0.x
+            9.0.x
+
+      - name: Pack
+        run: dotnet pack /p:ContinuousIntegrationBuild=true --output package
+
+      - name: Publish nupkg and snupkg to NuGet.org
+        run: |
+          foreach($file in (Get-ChildItem -Path package -Recurse -Include "*.nupkg")) {
+              Write-Host "Publishing nupkg and snupkg:: " $file.FullName
+              dotnet nuget push $file.FullName --api-key "${{ secrets.NUGET_ORG_FHI_PUBLISH }}" --source https://api.nuget.org/v3/index.json --skip-duplicate
+          }