create a Dialog for adding new app launchers

app/src/main/kotlin/com/simplemobiletools/applauncher/activities/MainActivity.kt

@@ -7,6 +7,7 @@ import android.view.MenuItem
 import com.simplemobiletools.applauncher.R
 import com.simplemobiletools.applauncher.adapters.MyCursorAdapter
 import com.simplemobiletools.applauncher.databases.DbHelper
+import com.simplemobiletools.applauncher.dialogs.AddAppDialog
 import com.simplemobiletools.applauncher.extensions.isFirstRun
 import com.simplemobiletools.applauncher.extensions.preferences
 import com.simplemobiletools.applauncher.extensions.viewIntent
@@ -27,7 +28,10 @@ class MainActivity : SimpleActivity() {
                 startActivity(viewIntent("https://play.google.com/store/apps/details?id=" + it.pkgName))
             }
         }
-        fab.setOnClickListener { }
+
+        fab.setOnClickListener {
+            AddAppDialog().show(fragmentManager, "")
+        }
     }
 
     override fun onCreateOptionsMenu(menu: Menu?): Boolean {

app/src/main/kotlin/com/simplemobiletools/applauncher/dialogs/AddAppDialog.kt

@@ -0,0 +1,20 @@
+package com.simplemobiletools.applauncher.dialogs
+
+import android.app.AlertDialog
+import android.app.Dialog
+import android.app.DialogFragment
+import android.os.Bundle
+import com.simplemobiletools.applauncher.R
+
+class AddAppDialog() : DialogFragment() {
+    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
+        val builder = AlertDialog.Builder(activity)
+        builder.setTitle(R.string.add_apps)
+        builder.setPositiveButton(android.R.string.ok, { dialogInterface, i ->
+
+        })
+
+        builder.setNegativeButton(android.R.string.cancel, null)
+        return builder.create()
+    }
+}

app/src/main/res/values/strings.xml

@@ -10,6 +10,7 @@
     <string name="rate_us_underlined"><u>Rate us in the Play Store</u></string>
     <string name="follow_us">Follow us:</string>
     <string name="copyright">v %1$s\nCopyright © Simple Mobile Tools %2$d</string>
+    <string name="add_apps">Add application launchers</string>
 
     <!-- Settings -->
     <string name="settings">Settings</string>