cli updates 2 (#12447)

- extras group
- readme
- another readme

---------

Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>

libs/cli/README.md

@@ -1,54 +1,5 @@
 # langchain-cli
 
-Install CLI
+[Docs](./DOCS.md)
 
-`pip install -U --pre langchain-cli`
-
-Create new langchain app
-
-`langchain serve new my-app`
-
-Go into app
-
-`cd my-app`
-
-Install a package
-
-`langchain serve add extraction-openai-functions`
-
-Install langserve
-
-`pip install "langserve[all]"`
-
-Install the langchain package
-
-`pip install -e packages/extraction-openai-functions`
-
-Edit `app/server.py` to add that package to the routes
-
-```markdown
-from fastapi import FastAPI
-from langserve import add_routes
-from extraction_summary.chain import chain
-
-app = FastAPI()
-
-add_routes(app, chain)
-```
-
-Set env vars
-
-```shell
-export OPENAI_API_KEY=...
-```
-
-```shell
-export LANGCHAIN_TRACING_V2=true
-export LANGCHAIN_ENDPOINT="https://api.smith.langchain.com"
-export LANGCHAIN_API_KEY="<your-api-key>"
-export LANGCHAIN_PROJECT="extraction-openai-functions"
-```
-
-Run the app
-
-`python app/server.py`
+[LangServe Templates Quickstart](../../templates/README.md)