Exporting onnx instructions.

extras/mmdeploy/README.md

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+# Exporting MMPose models
+
+```bash
+docker build --progress=plain -f extras/mmdeploy/dockerfile -t rpt_mmdeploy .
+
+./extras/mmdeploy/run_container.sh
+```
+
+<br>
+
+## ONNX
+
+```bash
+cd /mmdeploy/
+cp /RapidPoseTriangulation/extras/mmdeploy/configs/detection_onnxruntime_static-320x320.py configs/mmdet/detection/
+
+python3 ./tools/deploy.py \
+    configs/mmdet/detection/detection_onnxruntime_static-320x320.py \
+    /mmpose/projects/rtmpose/rtmdet/person/rtmdet_nano_320-8xb32_coco-person.py \
+    https://download.openmmlab.com/mmpose/v1/projects/rtmpose/rtmdet_nano_8xb32-100e_coco-obj365-person-05d8511e.pth \
+    /mmpose/projects/rtmpose/examples/onnxruntime/human-pose.jpeg \
+    --work-dir work_dir \
+    --show
+
+mv /mmdeploy/work_dir/end2end.onnx /RapidPoseTriangulation/extras/mmdeploy/exports/rtmdet_nano_320.onnx
+```
+
+```bash
+cd /mmdeploy/
+cp /RapidPoseTriangulation/extras/mmdeploy/pose-detection_simcc_onnxruntime_static-384x288.py configs/mmpose/
+
+python3 ./tools/deploy.py \
+    configs/mmpose/pose-detection_simcc_onnxruntime_static-384x288.py \
+    /mmpose/projects/rtmpose/rtmpose/body_2d_keypoint/rtmpose-m_8xb256-420e_coco-384x288.py \
+    https://download.openmmlab.com/mmpose/v1/projects/rtmposev1/rtmpose-m_simcc-body7_pt-body7_420e-384x288-65e718c4_20230504.pth \
+    /mmpose/projects/rtmpose/examples/onnxruntime/human-pose.jpeg \
+    --work-dir work_dir \
+    --show
+
+mv /mmdeploy/work_dir/end2end.onnx /RapidPoseTriangulation/extras/mmdeploy/exports/rtmpose-m_384.onnx
+```