添加devim2 c++示例；移除inverse_sigmoid操作

CPP/ax_deimv2_qrcode_batch

@@ -0,0 +1,3 @@
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README.md

@@ -53,6 +53,7 @@ Download all files from this repository to the device
 root@ax650:~/QRCode_det# tree
 .
 |-- CPP
+|   |-- ax_deimv2_qrcode_batch
 |   |-- ax_yolov5_qrcode_batch
 |   `-- ax_yolov8_qrcode_batch
 |-- README.md
@@ -69,6 +70,7 @@ root@ax650:~/QRCode_det# tree
 |   |   |-- yolov8n_npu1.axmodel
 |   |   `-- yolov8n_npu2.axmodel
 |   |-- AX637
+|   |   |-- deimv2_hgnetv2_femto_coco_npu1.axmodel
 |   |   |-- yolov5n_npu1.axmodel
 |   |   `-- yolov8n_npu1.axmodel
 |   |-- AX650
@@ -76,6 +78,7 @@ root@ax650:~/QRCode_det# tree
 |   |   |-- yolov5n_npu3.axmodel
 |   |   `-- yolov8n_npu3.axmodel
 |   `-- CPP
+|       |-- deimv2_hgnetv2_femto_coco_cpp_npu3.axmodel
 |       |-- yolov5n_cpp_npu3.axmodel
 |       `-- yolov8n_cpp_npu3.axmodel
 |-- python
@@ -132,9 +135,7 @@ Output:
 
 ##### C++
 ```
-./ax_yolov8_qrcode_batch -m yolov8n_cpp_npu3.axmodel -i images/ -o res/
-or
-./ax_yolov5_qrcode_batch -m yolov5n_cpp_npu3.axmodel -i images/ -o res/
+./ax_xxx_qrcode_batch -m xxx_cpp_npu3.axmodel -i images/ -o res/
 ```
 
 Output:

model/AX637/deimv2_hgnetv2_femto_coco_npu1.axmodel

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model/AX650/deimv2_hgnetv2_femto_coco_npu3.axmodel

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model/CPP/deimv2_hgnetv2_femto_coco_cpp_npu3.axmodel

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