Use GitHub actions (Remove AppVeyor)

Author: justcoding121

.build/build.ps1

@@ -1,9 +1,6 @@
 $Here = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
-
-$pfx = new-object System.Security.Cryptography.X509Certificates.X509Certificate2 
 $certPath = "$Here\lib\rootCert.pfx"
-$pfxPass =  ""
-$pfx.import($certPath,$pfxPass,"Exportable,PersistKeySet") 
+$pfx = New-Object -TypeName System.Security.Cryptography.X509Certificates.X509Certificate2($certPath,"","Exportable,PersistKeySet")
 $store = new-object System.Security.Cryptography.X509Certificates.X509Store([System.Security.Cryptography.X509Certificates.StoreName]::Root, "localmachine")
 $store.open("MaxAllowed") 
 $store.add($pfx) 

.build/cleanup-cache.txt

@@ -0,0 +1,50 @@
+name: .NET Core
+
+on:
+  push:
+    branches:
+        - develop
+        - beta
+        - stable
+  pull_request:
+    branches:
+        - develop
+        - beta
+        - stable
+      
+jobs:
+  build:
+    runs-on: windows-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install DocFX
+      run: choco install docfx -y
+    - name: Build 
+      run: dotnet build src/Titanium.Web.Proxy/Titanium.Web.Proxy.csproj
+    - name: Test 
+      shell: pwsh
+      run: |
+        .\.github\install-unit-test-certificate.ps1
+        dotnet test tests/Titanium.Web.Proxy.UnitTests/Titanium.Web.Proxy.UnitTests.csproj
+        dotnet test tests/Titanium.Web.Proxy.IntegrationTests/Titanium.Web.Proxy.IntegrationTests.csproj
+    - name: Update Documentation
+      if: github.ref == 'refs/heads/develop'
+      run: docfx .github/docfx.json
+    - name: Publish Documentation
+      if: github.ref == 'refs/heads/develop'
+      uses: EndBug/add-and-commit@v9
+      with:
+        default_author: github_actions
+        message: Update documentation
+        committer_name: GitHub Actions
+        committer_email: [email protected]
+    - name: Publish Beta
+      if: github.ref == 'refs/heads/beta'
+      run: |
+       dotnet pack src/Titanium.Web.Proxy/Titanium.Web.Proxy.csproj --version-suffix "beta"
+       dotnet nuget push **\*.nupkg -s "nuget" -k "${{ secrets.NUGET_TOKEN }}"
+    - name: Publish Stable
+      if: github.ref == 'refs/heads/stable'
+      run: |
+       dotnet pack src/Titanium.Web.Proxy/Titanium.Web.Proxy.csproj
+       dotnet nuget push **\*.nupkg -s "nuget" -k "${{ secrets.NUGET_TOKEN }}"