Add convenience VSCode task for SuperDirt

.vscode/tasks.json

@@ -0,0 +1,21 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "SuperDirt",
+            "type": "shell",
+            "command": "tools/superdirt.sh",
+            "isBackground": true,
+            "problemMatcher": {
+                "base": "$tsc-watch",
+                "background": {
+                    "activeOnStart": true,
+                    "beginsPattern": "compiling class library...",
+                    "endsPattern": "SuperDirt: listening on port \\d+"
+                },
+            }
+        }
+    ]
+}