Add manifests and feature dataset documentation

README.md

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+# OpenWAM Robotwin Features
+
+Features and similarity measurements extracted for the OpenWAM Robotwin
+downstream evaluation.
+
+## Contents
+
+- `agilex_temporal_features/`: Agilex temporal DepthV3, DINOv2 and related features.
+- `franka_temporal_features/`: Franka temporal features.
+- `agilex_features/`, `franka_features/`: other OpenWAM feature outputs.
+- `cka/`, `cka_rbf/`: similarity measurements.
+- `manifests/`: source manifests defining task, episode, video and frame alignment.
+
+The temporal feature extraction alignment is 33 frames with stride 4. The
+corresponding Robotwin GT extractor is provided in the runtime repository:
+`lishanyang/openwam-robotwin-runtime`.
+
+Do not infer missing episodes from directory counts; use the manifest files and
+the generated GT index files for evaluation splits.