init: add mockup files for system workflow (UI, RAG, LLM) and requirements.txt

requirements.txt

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+gradio
+huggingface_hub
+langchain
+langchain-openai
+langchain_experimental
+chromadb
+pyyaml
+pypdf
+openai

src/llm.py

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+class ChatLLM:
+    def __init__(self) -> None:
+        pass
+    
+class EmbeddingLLM:
+    def __init__(self) -> None:
+        pass

src/rag.py

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+class RAG:
+    def __init__(self) -> None:
+        pass

src/ui.py

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+class UI:
+    def __init__(self) -> None:
+        pass

src/util.py

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+class MemoryUpdate:
+    def __init__(self) -> None:
+        pass