Add youdotcom retriever (#11304)

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/extras/integrations/retrievers/you-retriever.ipynb

@@ -0,0 +1,62 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "id": "47828a7a",
+   "metadata": {},
+   "source": [
+    "## Using the You.com Retriever\n",
+    "The retriever from You.com is good for retrieving lots of text. We return multiple of the best text snippets per URL we find to be relevant.\n",
+    "\n",
+    "First you just need to initialize the retriever"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "a90d61d4",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "from langchain.retrievers.you_retriever import YouRetriever\n",
+    "from langchain.chains import RetrievalQA\n",
+    "from langchain.llms import OpenAI\n",
+    "\n",
+    "yr = YouRetriever()\n",
+    "qa = RetrievalQA.from_chain_type(llm=OpenAI(), chain_type=\"map_reduce\", retriever=yr)\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "4a223f2f",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "query = \"what starting ohio state quarterback most recently went their entire college career without beating Michigan?\"\n",
+    "qa.run(query)"
+   ]
+  }
+ ],
+ "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": "3.9.17"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}