docs: add page for Firestore Chat Message History integration (#15554)

- **Description:** Adds documentation for the
`FirestoreChatMessageHistory` integration and lists integration in
Google's documentation
  - **Issue:** NA
  - **Dependencies:** No

---------

Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

docs/docs/integrations/memory/firestore_chat_message_history.ipynb

@@ -0,0 +1,147 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "91c6a7ef",
+   "metadata": {},
+   "source": [
+    "# Google Cloud Firestore\n",
+    "\n",
+    "> [`Cloud Firestore`](https://cloud.google.com/firestore) is a NoSQL document database built for automatic scaling, high performance, and ease of application development.\n",
+    "\n",
+    "This notebook goes over how to use Firestore to store chat message history."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "2d6ed3c8-b70a-498c-bc9e-41b91797d3b7",
+   "metadata": {},
+   "source": [
+    "## Setting up"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "b8eca282",
+   "metadata": {},
+   "source": [
+    "To run this notebook, you will need a Google Cloud Project, a Firestore database instance in Native Mode, and Google credentials, see [Firestore Quickstarts](https://cloud.google.com/firestore/docs/quickstarts)."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "5a7f3b3f-d9b8-4577-a7ef-bdd8ecaedb70",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "!pip install firebase-admin"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "a8e63850-3e14-46fe-a59e-be6d6bf8fe61",
+   "metadata": {},
+   "source": [
+    "## Basic Usage"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "id": "d15e3302",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain_community.chat_message_histories.firestore import (\n",
+    "    FirestoreChatMessageHistory,\n",
+    ")\n",
+    "\n",
+    "message_history = FirestoreChatMessageHistory(\n",
+    "    collection_name=\"langchain-chat-history\",\n",
+    "    session_id=\"user-session-id\",\n",
+    "    user_id=\"user-id\",\n",
+    ")\n",
+    "\n",
+    "message_history.add_user_message(\"hi!\")\n",
+    "message_history.add_ai_message(\"whats up?\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 6,
+   "id": "64fc465e",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "[HumanMessage(content='hi!'),\n",
+       " HumanMessage(content='hi!'),\n",
+       " AIMessage(content='whats up?')]"
+      ]
+     },
+     "execution_count": 6,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "message_history.messages"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "4be8576e",
+   "metadata": {},
+   "source": [
+    "## Custom Firestore Client"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "12999273",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import firebase_admin\n",
+    "from firebase_admin import credentials, firestore\n",
+    "\n",
+    "# Use a service account.\n",
+    "cred = credentials.Certificate(\"path/to/serviceAccount.json\")\n",
+    "\n",
+    "app = firebase_admin.initialize_app(cred)\n",
+    "client = firestore.client(app=app)\n",
+    "\n",
+    "message_history = FirestoreChatMessageHistory(\n",
+    "    collection_name=\"langchain-chat-history\",\n",
+    "    session_id=\"user-session-id\",\n",
+    "    user_id=\"user-id\",\n",
+    "    firestore_client=client,\n",
+    ")"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.11.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}

docs/docs/integrations/platforms/google.mdx

@@ -507,6 +507,23 @@ See a [usage example and authorization instructions](/docs/integrations/toolkits
 from langchain_community.agent_toolkits import GmailToolkit
 ```
 
+## Memory
+
+### Cloud Firestore
+
+> [`Cloud Firestore`](https://cloud.google.com/firestore) is a NoSQL document database built for automatic scaling, high performance, and ease of application development.
+
+First, we need to install the python package.
+
+```bash
+pip install firebase-admin
+```
+
+See a [usage example and authorization instructions](/docs/integrations/memory/firestore_chat_message_history).
+
+```python
+from langchain_community.chat_message_histories.firestore import  FirestoreChatMessageHistory
+```
 
 ## Chat Loaders