feat(java): add kmp-lsp as an alternative language server (#1891)

README.md

@@ -78,5 +78,6 @@ the [official plugins](plugins/official). The plugin API is still a preview.
 
 Database tool window notes, including Oracle Instant Client setup, are in
 [`docs/databases.md`](docs/databases.md).
+Java language server choices and their capabilities are in [`docs/java.md`](docs/java.md).
 
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