Adjust directory structure from Zhao_Jiasheng

it is perfect

.gitignore

@@ -0,0 +1 @@
+.vscode

.vscode/settings.json

@@ -1,40 +0,0 @@
-{
-    "files.associations": {
-        "xs_adapter_manager.h": "c",
-        "xs_adapter_at_nbiot.h": "c",
-        "xs_klist.h": "c",
-        "user_api.h": "c",
-        "xs_adapter_def.h": "c",
-        "xs_adapter_at_agent.h": "c",
-        "xs_adapter_at.h": "c",
-        "bus_serial.h": "c",
-        "xs_adapter_at_wifi.h": "c",
-        "dev_serial.h": "c",
-        "xs_adapter.h": "c",
-        "stdbool.h": "c",
-        "xs_base.h": "c",
-        "stddef.h": "c",
-        "ostream": "cpp",
-        "sensor.h": "c",
-        "string.h": "c",
-        "adapter.h": "c",
-        "array": "c",
-        "chrono": "c",
-        "functional": "c",
-        "istream": "c",
-        "ratio": "c",
-        "tuple": "c",
-        "type_traits": "c",
-        "utility": "c",
-        "string_view": "c",
-        "stm32f4xx.h": "c",
-        "extmem.h": "c",
-        "system_stm32f4xx.h": "c",
-        "core_cm4.h": "c",
-        "stdint.h": "c",
-        "board.h": "c",
-        "connect_usart.h": "c",
-        "device.h": "c",
-        "xiuos.h": "c"
-    }
-}