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replicate readme

add replicate to integration

simple replicate test

rename api key to token, and update to latest python client

update replicate docs

docs/ecosystem/replicate.md

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+# Replicate
+This page covers how to use the Replicate ecosystem within LangChain.
+
+## Installation and Setup
+- Create a [Replicate](https://replicate.com) account. Get your api key and set it as an environment variable (`REPLICATE_API_TOKEN`)
+- Install the [Replicate python client](https://github.com/replicate/replicate-python) with `pip install replicate`
+
+## Calling a model
+
+Find a model on the [replicate explore page](https://replicate.com/explore), and then paste in the model name and version in this format: model_name/version
+
+For example, for this [flan-t5 model]( https://replicate.com/daanelson/flan-t5), click on the API tab. The model name/version would be: `daanelson/flan-t5:04e422a9b85baed86a4f24981d7f9953e20c5fd82f6103b74ebc431588e1cec8`
+
+Only the `model` param is required, but we can add other model params when initializing.
+
+For example, if we were running stable diffusion and wanted to change the image dimensions:
+
+```
+Replicate(model="stability-ai/stable-diffusion:db21e45d3f7023abc2a46ee38a23973f6dce16bb082a930b0c49861f96d1e5bf",
+          image_dimensions='512x512')
+```
+
+*Note that only the first output of a model will be returned.*
+
+From here, we can initialize our model:
+
+```python
+llm = Replicate(model="daanelson/flan-t5:04e422a9b85baed86a4f24981d7f9953e20c5fd82f6103b74ebc431588e1cec8")
+```
+
+And run it:
+
+```python
+prompt = """
+Answer the following yes/no question by reasoning step by step.
+Can a dog drive a car?
+"""
+llm(prompt)
+```
+
+We can call any replicate model (not just LLMs) using this syntax. For example, we can call stable diffusion:
+
+```python
+text2image = Replicate(model="stability-ai/stable-diffusion:db21e45d3f7023abc2a46ee38a23973f6dce16bb082a930b0c49861f96d1e5bf",
+                       image_dimensions='512x512'
+
+image_output = text2image("A cat riding a motorcycle by Picasso")
+image_output
+```