create project and customercontroller

AB.API/AB.API.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

AB.API/AssemblyReference.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.API
+{
+    public class AssemblyReference
+    {
+    }
+}

AB.API/Controllers/CustomerController.cs

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+using AB.Contracts;
+using AB.Services.Abstractions;
+using Microsoft.AspNetCore.Mvc;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AB.API.Controllers
+{
+    [ApiController]
+    [Route("api/customers")]
+    public class CustomerController : ControllerBase
+    {
+
+        private readonly ICustomerService _customerService;
+
+
+        [HttpGet]
+        public async Task<IActionResult> GetCustomers(CancellationToken cancellationToken)
+        {
+            var customers = await _customerService.GetAllAsync(cancellationToken);
+
+            return Ok(customers);
+        }
+
+        [HttpGet("{customerId:guid}")]
+        public async Task<IActionResult> GetCustomerById(Guid customerId, CancellationToken cancellationToken)
+        {
+            var customer = await _customerService.GetByIdAsync(customerId, cancellationToken);
+
+            return Ok(customer);
+        }
+
+        [HttpPost]
+        public async Task<IActionResult> CreateCustomer([FromBody] CustomerForCreationDto customerForCreation)
+        {
+            var customerDto = await _customerService.CreateAsync(customerForCreation);
+            
+            return CreatedAtAction(nameof(CreateCustomer), new {customerId = customerDto.Id}, customerDto);
+        }
+
+        [HttpDelete("{customerId:guid}")]
+        public async Task<IActionResult> DeleteCustomer(Guid customerId, CancellationToken cancellationToken)
+        {
+            await _customerService.DeleteAsync(customerId, cancellationToken);
+
+            return NoContent();
+        }
+
+    }
+}