adding PersonRepository

api/Repositories/IPersonRepository.cs

@@ -0,0 +1,14 @@
+
+using api.Domain;
+
+namespace api.Repositories
+{
+    public interface IPersonRepository
+    {
+        Task<IEnumerable<Person>> GetAllAsync();
+        Task<Person> GetByUsernameAsync(String username);
+        Task AddAsync(Person person);
+        Task UpdateAsync(Person person);
+        Task DeleteAsync(String username);
+    }
+}