Add a message that says how much time was spent creating the project

Author: srmurguia

src/main/kotlin/com/google/androidstudiopoet/AndroidStudioPoet.kt

@@ -27,6 +27,7 @@ import java.awt.Font
 import java.io.File
 import javax.swing.*
 import javax.swing.border.EmptyBorder
+import kotlin.system.measureTimeMillis
 
 class AndroidStudioPoet(private val modulesWriter: SourceModuleWriter, config: Array<String>) : JFrame() {
 
@@ -85,9 +86,12 @@ class AndroidStudioPoet(private val modulesWriter: SourceModuleWriter, config: A
 
         val btnGenerate = JButton("Generate")
         btnGenerate.addActionListener {
-            println(textArea.text)
-            val configPOJO = gson.fromJson(textArea.text, ConfigPOJO::class.java)
-            modulesWriter.generate(ProjectBlueprint(configPOJO))
+            val timeSpent = measureTimeMillis {
+                println(textArea.text)
+                val configPOJO = gson.fromJson(textArea.text, ConfigPOJO::class.java)
+                modulesWriter.generate(ProjectBlueprint(configPOJO))
+            }
+            println("Finished in $timeSpent ms")
         }
         contentPane.add(btnGenerate, BorderLayout.SOUTH)