Add Kotlin API for audio tagging (#770)

kotlin-api-examples/OfflineStream.kt

@@ -0,0 +1,24 @@
+package com.k2fsa.sherpa.onnx
+
+class OfflineStream(var ptr: Long) {
+    fun acceptWaveform(samples: FloatArray, sampleRate: Int) =
+        acceptWaveform(ptr, samples, sampleRate)
+
+    protected fun finalize() {
+      if(ptr != 0L) {
+        delete(ptr)
+        ptr = 0
+      }
+    }
+
+    fun release() = finalize()
+
+    private external fun acceptWaveform(ptr: Long, samples: FloatArray, sampleRate: Int)
+    private external fun delete(ptr: Long)
+
+    companion object {
+        init {
+            System.loadLibrary("sherpa-onnx-jni")
+        }
+    }
+}