Update to NetCore 3.1, added Kestrel for REST api and few basic endpoints.

ASS.Server/Web/Controllers/StatusController.cs

@@ -0,0 +1,34 @@
+using ASS.Server.Services;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.DependencyInjection;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ASS.Server.Web.Controllers
+{
+    [ApiController]
+    [Route("[controller]")]
+    public class StatusController : ControllerBase
+    {
+
+        IServiceProvider serviceProvider;
+
+        public StatusController(IServiceProvider sp)
+        {
+            serviceProvider = sp;
+        }
+
+        [Route("")]
+        [Route("int")]
+        [HttpGet]
+        public IEnumerable<int> GetInt()
+        {
+            var rng = new Random();
+            var grpc = serviceProvider.GetRequiredService<GrpcService>();
+            if (!grpc.IsInitilized)
+                grpc.Initialize();
+            return new int[] { rng.Next() };
+        }
+    }
+}