transfer python bindings code

gpt4all-bindings/python/docs/index.md

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+# GPT4All
+
+In this package, we introduce Python bindings built around GPT4All's C/C++ ecosystem.
+
+## Quickstart
+
+```bash
+pip install gpt4all
+```
+
+In Python, run the following commands to retrieve a GPT4All model and generate a response
+to a prompt.
+
+**Download Note*:*
+By default, models are stored in `~/.cache/gpt4all/` (you can change this with `model_path`). If the file already exists, model download will be skipped.
+
+```python
+import gpt4all
+gptj = gpt4all.GPT4All("ggml-gpt4all-j-v1.3-groovy")
+messages = [{"role": "user", "content": "Name 3 colors"}]
+gptj.chat_completion(messages)
+```