Add Android read aloud support

composeApp/src/jvmMain/kotlin/net/sergeych/toread/ReadAloudPlatform.jvm.kt

@@ -0,0 +1,15 @@
+package net.sergeych.toread
+
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+actual object ReadAloudPlatform {
+    actual val isSupported: Boolean = false
+    private val mutableState = MutableStateFlow(ReadAloudState())
+    actual val state: StateFlow<ReadAloudState> = mutableState
+
+    actual fun prepare(bookTitle: String, sentences: List<ReadAloudSentence>, startIndex: Int) = Unit
+    actual fun play() = Unit
+    actual fun stop() = Unit
+    actual fun skip(delta: Int) = Unit
+}