docs: Add Ray Forward 2025 slides and update README 📄

- add 13 presentation PDF files for Ray Forward 2025 event
- update README.md with event description and link to Chinese version
- add README_CN.md providing Chinese translation of resources page

Signed-off-by: mingcheng <mingcheng@apache.org>

Author: mingcheng

README.md

@@ -1,2 +1,7 @@
-# Ray-Forward
-Some resources about Ray Forward Meetup
+# Ray Forward Community Event Resources
+
+The Chinese version of this page can be found [here](./README_CN.md).
+
+Ray Forward is the annual community event of the Ray Chinese community. The event brings together local Ray practitioners to discuss practical use cases and tackle technical challenges.
+
+This page collects resources from past Ray Forward community events, including event recaps, slides, videos, and more.

README_CN.md

@@ -0,0 +1,5 @@
+# Ray Forward 社区活动资源
+
+Ray Forward 是 Ray 中文社区的年度社区活动。通过活动，可以将当地的 Ray 技术实践者聚集在一起，共同探讨 Ray 技术的实践案例和技术难题攻克。
+
+这里收集了 Ray Forward 历年社区活动的相关资源，包括活动回顾、PPT、视频等。