How to convert SOAP-based WCF service to RESTfull API

Question

Now I am having SOAP based WCF service, How can i convert that to RESTfull API.

My WCF Service will look like this.

[ServiceContract]
public interface ICategoryService
{
    [OperationContract]      
    bool UpdateCategory(CategoryEntity category);     
}


[ServiceBehavior(InstanceContextMode=InstanceContextMode.Single)]
public class CategoryService: ICategoryService
{
}