New: Migrated Apis to dotnet5.0

.gitignore

.gitlab-ci.yml

GitVersion.yml

LICENSE

build.cake

build.ps1

build.sh

nunit3-junit.xslt

src/LegacySTS.sln

src/LegacySTS/App.config

src/LegacySTS/ApplicationInformation.cs

src/LegacySTS/Configurator.cs

src/LegacySTS/Controllers/STSController.cs

src/LegacySTS/LegacySTS.csproj

src/LegacySTS/ModelingObjects/SignInInstance.cs

src/LegacySTS/ModelingObjects/UserObject.cs

src/LegacySTS/Program.cs

src/LegacySTS/Properties/AssemblyInfo.cs

src/LegacySTS/Security/CustomSecurityTokenService.cs

src/LegacySTS/Startup.cs