feat(apiv2): group stubs, authentication middleware, /systems/:id endpoint

PluralKit.API/Controllers/v2/GroupControllerV2.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Threading.Tasks;
+
+using Microsoft.AspNetCore.Mvc;
+
+using Newtonsoft.Json.Linq;
+
+using PluralKit.Core;
+
+namespace PluralKit.API
+{
+    [ApiController]
+    [ApiVersion("2.0")]
+    [Route("v{version:apiVersion}")]
+    public class GroupControllerV2: PKControllerBase
+    {
+        public GroupControllerV2(IServiceProvider svc) : base(svc) { }
+
+        [HttpGet("systems/{system_id}/groups")]
+        public async Task<IActionResult> GetSystemGroups(string system_id)
+        {
+            return new ObjectResult("Unimplemented")
+            {
+                StatusCode = 501
+            };
+        }
+
+        [HttpPost("groups")]
+        public async Task<IActionResult> GroupCreate(string group_id)
+        {
+            return new ObjectResult("Unimplemented")
+            {
+                StatusCode = 501
+            };
+        }
+
+        [HttpGet("groups/{group_id}")]
+        public async Task<IActionResult> GroupGet(string group_id)
+        {
+            return new ObjectResult("Unimplemented")
+            {
+                StatusCode = 501
+            };
+        }
+
+        [HttpPatch("groups/{group_id}")]
+        public async Task<IActionResult> GroupPatch(string group_id)
+        {
+            return new ObjectResult("Unimplemented")
+            {
+                StatusCode = 501
+            };
+        }
+
+        [HttpDelete("groups/{group_id}")]
+        public async Task<IActionResult> GroupDelete(string group_id)
+        {
+            return new ObjectResult("Unimplemented")
+            {
+                StatusCode = 501
+            };
+        }
+
+
+    }
+}