Create README.md

Author: ianchb

README.md

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+# xn_recaptcha
+reCAPTCHA for Xiuno BBS.  
+Now it only supports **reCAPTCHA v2 Checkbox**, and may contains bugs.  
+![image](https://user-images.githubusercontent.com/45872450/182069828-d8ad255b-3117-4781-94ab-416edcd1eec0.png)  
+
+--------
+
+This project is edited from [MaZhaolin/zl-vaptcha](https://github.com/MaZhaolin/zl-vaptcha).  
+This project is powered by [Google reCAPTCHA](https://www.google.com/recaptcha/about/).