Added usefriends hook

daily-thought-frontend/src/hooks/useFriends.ts

+import { useState, useEffect } from "react"
+
+export const useFriends = () => {
+  const [friends, setFriends] = useState<Map<string, any> | undefined>(undefined)
+
+  const fetchFriends = async () => {
+    const endpoint = `${process.env.NEXT_PUBLIC_FRIEND_SERVICE_URL}friends`
+
+    const headers =  {'Authorization': `Bearer ${sessionStorage.getItem("token")}`}
+    const response = await fetch(endpoint, {headers})
+    return await response.json()
+
+  
+  }
+
+  const fetchUserList = async (userIdList: string[]) => {
+    const endpoint = `${process.env.NEXT_PUBLIC_USER_SERVICE_URL}api/userlist`
+
+    console.log(userIdList, true)
+    
+    const JSONdata = JSON.stringify({
+      userIdList
+    })
+    const options = {
+      method: 'POST',
+      headers: {'Content-Type': 'application/json',},
+      body: JSONdata,
+    }
+    
+    const response = await fetch(endpoint, options)
+    return await response.json()
+  }
+
+  useEffect(() => {
+    if(friends === undefined){
+      fetchFriends().then(res => {
+        fetchUserList(res.result).then(userlistRes => {
+          setFriends(new Map(userlistRes.userList))
+        })
+        
+      })
+    }
+  })
+  return friends 
+}
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