chore: update readme [ci skip]

Author: ybw0014

README.md

@@ -10,16 +10,29 @@ features and improvements.
 
 ## Download
 
-(WIP, check Slimefun discord for preview builds)
+> [!WARNING]
+> PREVIEW BUILDS
+>
+> These are early development versions and do not include auto-updates. While most features are completed,
+> remaining content may still undergo significant changes. There may also be breaking updates, although we will try to
+> minimize/avoid these.
+
+Preview builds: [Click here to download](https://staging.resources.guizhanss.com/plugin/InfinityExpansion2/versions)
 
 ### Requirement
 
 - Java 17 or higher
 - Minecraft 1.20 or higher
 - Paper or its forks
+- Slimefun [official](https://github.com/Slimefun/Slimefun4) / [Chinese fork](https://github.com/SlimefunGuguProject/Slimefun4)
 - (Optional) SlimefunTranslation
 - (Optional) SlimeHUD
 
+> [!WARNING]
+> We do not provide direct support for [Slimefun United](https://github.com/Slimefun-United/Slimefun-United). While its
+> code is based on Chinese fork, we believe that InfinityExpansion2 can run on Slimefun United. However, we do not
+> guarantee compatibility.
+
 ## Wiki
 
 [Click to visit the wiki](https://docs.ybw0014.dev/infinity-expansion-2/)