add a Save menu item

app/src/main/kotlin/com/simplemobiletools/gallery/activities/EditActivity.kt

@@ -1,6 +1,8 @@
 package com.simplemobiletools.gallery.activities
 
 import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
 import com.simplemobiletools.gallery.R
 import com.theartofdev.edmodo.cropper.CropImageView
 import kotlinx.android.synthetic.main.activity_edit.*
@@ -14,4 +16,18 @@ class EditActivity : SimpleActivity() {
             guidelines = CropImageView.Guidelines.OFF
         }
     }
+
+    override fun onCreateOptionsMenu(menu: Menu?): Boolean {
+        menuInflater.inflate(R.menu.menu_editor, menu)
+        return true
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            R.id.save -> {
+                return true
+            }
+        }
+        return super.onOptionsItemSelected(item)
+    }
 }