Abp: Create simplest Microservice startup template

[hikalkan]

• [x] Create the template.
• [x] Create a sample API.
• [x] Create IdentityServer4 host application.
• [x] Create a console application that authorizes and uses the sample API.
• [x] Configure IdentityServer4 for authentication.
• [x] Create template downloading for this new template.

[natiki]

@hikalkan has the documentation caught up for this change? Is this the "ASP NET Core API Module (without UI)" on https://abp.io/Templates?

[hikalkan]

Yes. But there is no documentation yet.