Add project files.

README.md

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+# Practice Calendar Api project
+
+## Projects
+- API - (REST) webservice endpoint with OpenAPI capabilities (swagger)
+- Domain - containd core elements of the domain (entities, domain events, interfaces)
+- Infrastructure - plugged dependencies like persitence, email, files operations
+- UnitTests - for aggregate and application domain testing
+
+## Running unit tests
+
+```sh
+dotnet test
+```
+
+## Running the api service
+
+```sh
+ dotnet run --project .\PracticeCalendar.Api\PracticeCalendar.API.csproj
+```