Merge pull request #1 from Wu-Xinyu/Wu-Xinyu-patch-1

Update tools.en.mdx

Author: Wu-Xinyu

pages/tools.en.mdx

@@ -58,3 +58,4 @@
 - [SmartGPT](https://getsmartgpt.com)
 - [ThoughtSource](https://github.com/OpenBioLink/ThoughtSource)
 - [Visual Prompt Builder](https://tools.saxifrage.xyz/prompt)
+- [YiVal](https://github.com/YiVal/YiVal)