Create README.md

Author: iProzd

examples/lmdb_downsample_data/README.md

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+# LMDB Example Data (Downsampled)
+
+**WARNING: This data is heavily downsampled and intended ONLY for testing
+the LMDB data loading pipeline. Do NOT use it for accuracy benchmarks or
+comparisons with the standard npy data format.**
+
+## Contents
+
+- `water_training.lmdb` - 80 frames downsampled from `water/data/data_0`
+- `water_validation.lmdb` - 20 frames downsampled from `water/data/data_2`
+- `input_lmdb.json` - Example training config using LMDB data
+
+## Usage
+
+```bash
+cd examples/lmdb_downsample_data
+dp --pt train input_lmdb.json
+```