set build flags for flash size

.vscode/tasks.json

@@ -0,0 +1,13 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "type": "npm",
+            "script": "install",
+            "path": ".piolibdeps/sprocket-core/tools/",
+            "problemMatcher": []
+        }
+    ]
+}