Add config files to default flash config

CMakeLists.txt

@@ -6,3 +6,5 @@ include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(blinky)
 
 target_add_binary_data(blinky.elf "main/broker.pem" TEXT)
+
+spiffs_create_partition_image(storage files FLASH_IN_PROJECT)

files/blinky.json

@@ -0,0 +1 @@
+{"length":50, "state": "ON", "effect": "rainbow"}