Add deprecation notice of the Java-based implementation

Author: tankyleo

README.md

@@ -60,6 +60,9 @@ demand from wallets and may slip to a later date. Refer to [LDK-Roadmap] for mor
 
 See the [VSS API contract] for details.
 
+> [!CAUTION]
+> The Java-based implementation of VSS-server is now **deprecated**; please use the Rust-based VSS-server implementation instead.
+
 ### Implementation
 
 Currently, VSS-server has a Java-based implementation and is ready to use. Support for a Rust-based VSS-server is a work

java/INSTALL.md

@@ -1,3 +1,6 @@
+> [!CAUTION]
+> The Java-based implementation of VSS-server is now **deprecated**; please use the Rust-based VSS-server implementation instead.
+
 #  Installation guide without docker
 
 ## Ubuntu

java/README.md

@@ -1,3 +1,6 @@
+> [!CAUTION]
+> The Java-based implementation of VSS-server is now **deprecated**; please use the Rust-based VSS-server implementation instead.
+
 # Versioned Storage Service (Java)
 
 This directory hosts the Java-based implementation of the Versioned Storage Service (VSS).