community: Added Lantern as VectorStore

docs/docs/integrations/providers/lantern.mdx

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+# Lantern
+
+This page covers how to use the [Lantern](https://github.com/lanterndata/lantern) within LangChain
+It is broken into two parts: setup, and then references to specific Lantern wrappers.
+
+## Setup
+1. The first step is to create a database with the `lantern` extension installed.
+
+    Follow the steps at [Lantern Installation Guide](https://github.com/lanterndata/lantern#-quick-install) to install the database and the extension. The docker image is the easiest way to get started.
+
+## Wrappers
+
+### VectorStore
+
+There exists a wrapper around Postgres vector databases, allowing you to use it as a vectorstore,
+whether for semantic search or example selection.
+
+To import this vectorstore:
+```python
+from langchain_community.vectorstores import Lantern
+```
+
+### Usage
+
+For a more detailed walkthrough of the Lantern Wrapper, see [this notebook](/docs/integrations/vectorstores/lantern)