[ADDED] Some doc on where to put JSON file for testing

sample/src/main/kotlin/Main.kt

@@ -3,9 +3,13 @@ package dev.hossain.timeline.sample
 import dev.hossain.timeline.Parser
 import java.io.File
 
+/**
+ * Main entry point for testing the parser.
+ */
 suspend fun main() {
     println("Hello Sample!")
     val parser = Parser()
+    // Add the file in `sample/src/main/resources` directory
     val resource = {}.javaClass.getResource("/device-timeline.json")
     if (resource != null) {
         val file = File(resource.toURI())
@@ -18,6 +22,6 @@ suspend fun main() {
         val activityTypes: List<String> = timeline.rawSignals.map { it.activityRecord?.probableActivities?.map { it.type} ?: emptyList() }.flatten().distinct().sorted()
         println("Unique activities: $activityTypes")
     } else {
-        println("Resource not found")
+        println("The device timeline file not found in `sample/src/main/resources` directory.")
     }
 }