For the Server
Open Solution located at "BooksSeller.WebApi" folder and run "BooksSeller.WebApi" project.
For the Client
First you need to change WebApi base url at "web/app/src/typescript/app.ts". Search for the line ServiceConfig.baseAddress = "some address" and change to the current url of WebApi;
To run web app go to the folter "web" and run the command (gulp server)