added default build task

.vscode/tasks.json

@@ -0,0 +1,16 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+	"tasks": [
+		{
+			"label": "Compile",
+			"type": "shell",
+			"command": "make -s haxe",
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			}
+		}
+	]
+}