docs(readme): update

Author: markthree

README.md

@@ -1,7 +1,7 @@
 <div align="center">
     <img width="100%" height="100%" src="./snapshot.gif" />
     <h1><a href="https://github.com/markthree/go-get-folder-size">go-get-folder-size</a></h1>
-    <p>Get the size of a folder by recursively iterating through all its sub(files && folders). Use go, so high-speed</p>
+    <p>go concurrently get folder size quickly, can run in nodejs</p>
 </div>
 
 <br />
@@ -23,9 +23,9 @@
 
 ## motivation
 
-To quickly know the folder size，but
-[get-folder-size](https://github.com/alessioalex/get-folder-size) is implemented
-by nodejs, which is too slow。
+I want to know the folder size quickly, but the nodejs implementation of
+[get-folder-size](https://github.com/alessioalex/get-folder-size) is slow, so using
+go implements a recursive get folder size that runs in nodejs and is `7 ~ 20` times faster than the node native solution under normal circumstances。
 
 <br />
 

README_ZH.md

@@ -1,7 +1,7 @@
 <div align="center">
     <img width="100%" height="100%" src="https://raw.githubusercontent.com/markthree/go-get-folder-size/main/snapshot.gif" />
     <h1><a href="https://github.com/markthree/go-get-folder-size">go-get-folder-size</a></h1>
-    <p>递归获取文件夹大小，使用 go，足够快，可以跑在 node 中</p>
+    <p>go 并发快速获取文件夹大小，可以跑在 nodejs 中</p>
 </div>
 
 <br />
@@ -19,7 +19,7 @@
 
 想要快速知道文件夹大小，但 nodejs 实现的
 [get-folder-size](https://github.com/alessioalex/get-folder-size) 是慢的，所以用
-go 实现了递归获取文件夹大小，能跑在 nodejs 中。
+go 实现了递归获取文件夹大小，能跑在 nodejs 中，正常情况下，比 node 原生方案快 `7 ~ 20` 倍
 
 具体可见 issue 👉
 [get-folder-size/issues/22](https://github.com/alessioalex/get-folder-size/issues/22)