Add Kotlin and Java binding scaffolding

- Create directory structure and stub source files for Kotlin and Java
  bindings following the same pattern as Go/Rust/Swift
- Update bindings README and main README language table
- Add Kotlin and Java to v1.1 roadmap

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: deftio

README.md

@@ -108,6 +108,8 @@ All bindings are native implementations that read/write the `.trp` format direct
 | Go | Not yet implemented | `bindings/go/` |
 | Swift | Not yet implemented | `bindings/swift/` |
 | Rust | Not yet implemented | `bindings/rust/` |
+| Kotlin | Not yet implemented | `bindings/kotlin/` |
+| Java | Not yet implemented | `bindings/java/` |
 
 ## File Format
 
@@ -139,6 +141,8 @@ See `docs/internals/` for format details.
 - [ ] Go binding
 - [ ] Swift binding (with SPM package)
 - [ ] Rust binding (with crate on crates.io)
+- [ ] Kotlin binding
+- [ ] Java binding
 - [ ] npm package for JavaScript/TypeScript
 - [ ] PyPI package for Python
 

bindings/README.md

@@ -11,6 +11,8 @@ They do not use FFI or call into the C library.
 | Go         | [go/](./go/)               | Not yet implemented |
 | Swift      | [swift/](./swift/)         | Not yet implemented |
 | Rust       | [rust/](./rust/)           | Not yet implemented |
+| Kotlin     | [kotlin/](./kotlin/)       | Not yet implemented |
+| Java       | [java/](./java/)           | Not yet implemented |
 
 ## License
 

bindings/java/README.md

@@ -0,0 +1,23 @@
+# triepack — Java
+
+Native Java implementation of the Triepack `.trp` binary format.
+
+## Status
+
+Not yet implemented.
+
+## Build
+
+```bash
+./gradlew build
+```
+
+## Test
+
+```bash
+./gradlew test
+```
+
+## License
+
+Copyright (c) 2026 M. A. Chatterjee, BSD-2-Clause.

bindings/java/src/main/java/com/deftio/triepack/TriePack.java

@@ -0,0 +1,39 @@
+/*
+ * TriePack.java
+ *
+ * Native Java implementation of the TriePack (.trp) binary format.
+ *
+ * Copyright (c) 2026 M. A. Chatterjee
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+package com.deftio.triepack;
+
+import java.util.Map;
+
+/**
+ * Encodes and decodes key-value dictionaries in the TriePack (.trp) binary
+ * format.
+ */
+public class TriePack {
+
+    /**
+     * Encodes a map of key-value pairs into the .trp binary format.
+     *
+     * @param data The map to encode
+     * @return The encoded .trp binary data
+     */
+    public static byte[] encode(Map<String, Object> data) {
+        throw new UnsupportedOperationException("Not yet implemented");
+    }
+
+    /**
+     * Decodes a .trp binary blob into a map of key-value pairs.
+     *
+     * @param data The .trp binary data to decode
+     * @return The decoded key-value map
+     */
+    public static Map<String, Object> decode(byte[] data) {
+        throw new UnsupportedOperationException("Not yet implemented");
+    }
+}

bindings/java/src/test/java/com/deftio/triepack/TriePackTest.java

@@ -0,0 +1,18 @@
+/*
+ * TriePackTest.java
+ *
+ * Copyright (c) 2026 M. A. Chatterjee
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+package com.deftio.triepack;
+
+import org.junit.jupiter.api.Test;
+
+class TriePackTest {
+
+    @Test
+    void placeholder() {
+        // TODO: implement tests
+    }
+}

bindings/kotlin/README.md

@@ -0,0 +1,23 @@
+# triepack — Kotlin
+
+Native Kotlin implementation of the Triepack `.trp` binary format.
+
+## Status
+
+Not yet implemented.
+
+## Build
+
+```bash
+./gradlew build
+```
+
+## Test
+
+```bash
+./gradlew test
+```
+
+## License
+
+Copyright (c) 2026 M. A. Chatterjee, BSD-2-Clause.

bindings/kotlin/src/main/kotlin/com/deftio/triepack/TriePack.kt

@@ -0,0 +1,30 @@
+/*
+ * TriePack.kt
+ *
+ * Native Kotlin implementation of the TriePack (.trp) binary format.
+ *
+ * Copyright (c) 2026 M. A. Chatterjee
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+package com.deftio.triepack
+
+/**
+ * Encodes a map of key-value pairs into the .trp binary format.
+ *
+ * @param data The map to encode
+ * @return The encoded .trp binary data
+ */
+fun encode(data: Map<String, Any?>): ByteArray {
+    TODO("Not yet implemented")
+}
+
+/**
+ * Decodes a .trp binary blob into a map of key-value pairs.
+ *
+ * @param data The .trp binary data to decode
+ * @return The decoded key-value map
+ */
+fun decode(data: ByteArray): Map<String, Any?> {
+    TODO("Not yet implemented")
+}

bindings/kotlin/src/test/kotlin/com/deftio/triepack/TriePackTest.kt

@@ -0,0 +1,18 @@
+/*
+ * TriePackTest.kt
+ *
+ * Copyright (c) 2026 M. A. Chatterjee
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+package com.deftio.triepack
+
+import kotlin.test.Test
+
+class TriePackTest {
+
+    @Test
+    fun placeholder() {
+        // TODO: implement tests
+    }
+}