vscode: add default build task

.gitignore

@@ -15,3 +15,4 @@ build/
 *.la
 *.exe
 *.dll
+VMTests.md

.vscode/tasks.json

@@ -0,0 +1,19 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "nimbus test",
+      "type": "shell",
+      "command": "nimble test",
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "problemMatcher": [
+        "$gcc"
+      ]
+    }
+  ]
+}