Add project files.

SampleApplication/Controllers/ShapeController.cs

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+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using SampleApplication.Entities;
+
+namespace SampleApplication.Controllers
+{
+    [Route("api/shapes")]
+    public class ShapesController : ControllerBase
+    {
+
+        private readonly SampleDbContext _db;
+
+        private readonly ShapeProcessor _calculator;
+
+        public ShapesController(
+
+            SampleDbContext db,
+
+            ShapeProcessor calculator)
+
+        {
+
+            _db = db;
+
+            _calculator = calculator;
+
+        }
+
+        [HttpPost]
+
+        public IActionResult AddShapes(List<ShapeInput> shapes)
+
+        {
+
+            // TODO:
+
+            // - Validate
+
+            // - Ignore duplicate IDs
+
+            // - Save via EF Core
+            
+            this._calculator.AddShapes(shapes);
+
+            this._db.Shapes.AddRange(shapes);
+
+            return Ok(shapes);
+        }
+
+        [HttpGet("{id}")]
+
+        public async Task<IActionResult> Get(int id)
+
+        {
+
+            // TODO:
+
+            var shape = await this._db.Shapes.Where(s => s.Id == id).FirstOrDefaultAsync();
+
+            return Ok(shape);
+        }
+
+        [HttpGet("stats")]
+
+        public IActionResult Stats()
+
+        {
+
+            // TODO:
+
+            throw new NotImplementedException();
+
+        }
+
+    }
+}