Create dual_language_caption.md

docs/FAQ/dual_language_caption.md

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+---
+tags: [figure, show]
+---
+
+# figure 的 caption 如何实现双语？
+
+我个人推荐封装一个myfig(body, zhcaption, encaption)
+
+然后调用figure(body, kind: 'myfig', caption: metadata((.......zhcaption......encaption)))
+
+然后show figure.where(kind: 'myfig')从metadata里把双语拿出来
+
+```typst
+等人来写（）
+```