[add] Add README and requirements.txt

README.md

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+# Cobalt: Hybrid Search
+
+Cobalt is a demo app for hybrid search with vector and surface search using [Ruri](https://huggingface.co/cl-nagoya/ruri-large), [BM25](https://github.com/dorianbrown/rank_bm25) and [Voyager](https://spotify.github.io/voyager/). The name cobalt is derived from the word 瑠璃 (Ruri), which refers to cobalt glass.
+
+## Requirements
+
+- Python 3.10
+- rank_bm25
+- huggingface
+- voyager
+- Other Python packages are refer to [requirements.txt](./requirements.txt)

requirements.txt

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+# Utility
+pydantic==1.10
+ipython>=8.12
+psutil>=5.9
+pyyaml>=6.0
+typing_extensions==4.5.0
+loguru>=0.7.0
+tqdm
+python-dotenv
+
+# Visualization
+streamlit>=1.24
+st-pages
+streamlit-webrtc
+
+tqdm>=4.65
+matplotlib>=3.7
+seaborn>=0.12
+
+# Data handling
+numpy==1.26
+pandas>=2.0
+
+# Image
+opencv-python>=4.8
+pillow>=9.5
+
+# LLM
+
+# Others
+python-magic==0.4.27
+emoji>=2.6.0
+
+# search
+rank_bm25
+voyager
+
+# NLP
+mecab-python3
+unidic-lite
+fugashi
+sentence-transformers>=3.0
+
+# Notion
+notion-client
+notion2md