TEMPLATE Add VertexAI Chuck Norris template (#13531)

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---------

Co-authored-by: Erick Friis <erick@langchain.dev>

templates/vertexai-chuck-norris/LICENSE

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+MIT License
+
+Copyright (c) 2023 LangChain, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

templates/vertexai-chuck-norris/README.md

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+
+# vertexai-chuck-norris
+
+This template makes jokes about Chuck Norris using Vertex AI PaLM2. 
+
+## Environment Setup
+
+First, make sure you have a Google Cloud project with
+an active billing account, and have the [gcloud CLI installed](https://cloud.google.com/sdk/docs/install).
+
+Configure [application default credentials](https://cloud.google.com/docs/authentication/provide-credentials-adc):
+
+```shell
+gcloud auth application-default login
+```
+
+To set a default Google Cloud project to use, run this command and set [the project ID](https://support.google.com/googleapi/answer/7014113?hl=en) of the project you want to use:
+```shell
+gcloud config set project [PROJECT-ID]
+```
+
+Enable the [Vertex AI API](https://console.cloud.google.com/apis/library/aiplatform.googleapis.com) for the project:
+```shell
+gcloud services enable aiplatform.googleapis.com
+```
+
+## Usage
+
+To use this package, you should first have the LangChain CLI installed:
+
+```shell
+pip install -U langchain-cli
+```
+
+To create a new LangChain project and install this as the only package, you can do:
+
+```shell
+langchain app new my-app --package pirate-speak
+```
+
+If you want to add this to an existing project, you can just run:
+
+```shell
+langchain app add vertexai-chuck-norris
+```
+
+And add the following code to your `server.py` file:
+```python
+from vertexai_chuck_norris.chain import chain as vertexai_chuck_norris_chain
+
+add_routes(app, vertexai_chuck_norris_chain, path="/vertexai-chuck-norris")
+```
+
+(Optional) Let's now configure LangSmith. 
+LangSmith will help us trace, monitor and debug LangChain applications. 
+LangSmith is currently in private beta, you can sign up [here](https://smith.langchain.com/). 
+If you don't have access, you can skip this section
+
+
+```shell
+export LANGCHAIN_TRACING_V2=true
+export LANGCHAIN_API_KEY=<your-api-key>
+export LANGCHAIN_PROJECT=<your-project>  # if not specified, defaults to "default"
+```
+
+If you are inside this directory, then you can spin up a LangServe instance directly by:
+
+```shell
+langchain serve
+```
+
+This will start the FastAPI app with a server is running locally at 
+[http://localhost:8000](http://localhost:8000)
+
+We can see all templates at [http://127.0.0.1:8000/docs](http://127.0.0.1:8000/docs)
+We can access the playground at [http://127.0.0.1:8000/vertexai-chuck-norris/playground](http://127.0.0.1:8000/vertexai-chuck-norris/playground)  
+
+We can access the template from code with:
+
+```python
+from langserve.client import RemoteRunnable
+
+runnable = RemoteRunnable("http://localhost:8000/vertexai-chuck-norris")
+```

templates/vertexai-chuck-norris/pyproject.toml

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+[tool.poetry]
+name = "vertexai-chuck-norris"
+version = "0.0.1"
+description = ""
+authors = []
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = ">=3.8.1,<4.0"
+langchain = ">=0.0.325"
+google-cloud-aiplatform = "^1.36.4"
+
+[tool.poetry.group.dev.dependencies]
+langchain-cli = ">=0.0.15"
+fastapi = "^0.104.0"
+sse-starlette = "^1.6.5"
+
+[tool.langserve]
+export_module = "vertexai_chuck_norris.chain"
+export_attr = "chain"
+
+[build-system]
+requires = [
+    "poetry-core",
+]
+build-backend = "poetry.core.masonry.api"

templates/vertexai-chuck-norris/vertexai_chuck_norris/chain.py

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+from langchain.chat_models import ChatVertexAI
+from langchain.prompts import ChatPromptTemplate
+
+_prompt = ChatPromptTemplate.from_template(
+    "Tell me a joke about Chuck Norris and {text}"
+)
+_model = ChatVertexAI()
+
+# if you update this, you MUST also update ../pyproject.toml
+# with the new `tool.langserve.export_attr`
+chain = _prompt | _model