convert Settings activity to kotlin

app/src/main/kotlin/com/simplemobiletools/draw/activities/SettingsActivity.kt

@@ -0,0 +1,36 @@
+package com.simplemobiletools.draw.activities
+
+import android.os.Bundle
+import com.simplemobiletools.commons.extensions.updateTextColors
+import com.simplemobiletools.draw.Config
+import com.simplemobiletools.draw.R
+import kotlinx.android.synthetic.main.activity_settings.*
+
+class SettingsActivity : SimpleActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_settings)
+    }
+
+    override fun onResume() {
+        super.onResume()
+
+        setupCustomizeColors()
+        setupBrushSize()
+        updateTextColors(settings_holder)
+    }
+
+    private fun setupCustomizeColors() {
+        settings_customize_colors_holder.setOnClickListener {
+            startCustomizationActivity()
+        }
+    }
+
+    private fun setupBrushSize() {
+        settings_show_brush_size.isChecked = Config.newInstance(this).showBrushSizeEnabled
+        settings_show_brush_size_holder.setOnClickListener {
+            settings_show_brush_size.toggle()
+            Config.newInstance(this).showBrushSizeEnabled = settings_show_brush_size.isChecked
+        }
+    }
+}