feat: initial MNIST model, config, and README

README.md

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+---
+library_name: pytorch
+pipeline_tag: image-classification
+tags:
+- mnist
+- cnn
+- pytorch
+---
+
+# MNIST CNN (PyTorch)
+
+簡單的 CNN 手寫數字分類器，訓練於 MNIST 資料集。
+
+| Metric | Value |
+| ------ | ----- |
+| Validation Accuracy | 0.9898 |
+| Validation Loss | 0.0320 |
+
+## Usage
+```python
+import torch
+from model import SimpleCNN
+model = SimpleCNN()
+state = torch.load("pytorch_model.bin")
+model.load_state_dict(state)
+```

config.json

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+{
+  "input_shape": [
+    1,
+    28,
+    28
+  ],
+  "framework": "pytorch",
+  "architecture": "SimpleCNN",
+  "epochs": 3
+}

pytorch_model.bin

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+size 4802952

tb_logs/events.out.tfevents.1754325079.329cdbd66de4.600.0

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