Doc: Add mill-rust-jni to Thirdparty Plugins page (#2878)

Pull request: #2878

docs/modules/ROOT/pages/Thirdparty_Plugins.adoc

@@ -565,13 +565,13 @@ The name of the class that will contain all the members from
 
 The package name for the generated class.
 
+
 == Kotlin
 
 https://kotlinlang.org/[Kotlin] compiler support for mill.
 
 Project home: https://github.com/lefou/mill-kotlin
 
-
 [source,scala]
 ----
 // Load the plugin from Maven Central via ivy/coursier
@@ -782,6 +782,14 @@ Publishing to custom local Maven repository
 Publishing to /tmp/m2repo
 ----
 
+== Rust JNI
+
+A plugin for build Rust JNI code! 
+
+Project home: https://github.com/otavia-projects/mill-rust-jni
+
+For documentation please visit the https://github.com/otavia-projects/mill-rust-jni[mill-rust-jni project page].
+
 == ScalablyTyped
 
 https://scalablytyped.org/[Scalablytyped] support for mill.