Adding Android SDK Tools info (#1067)

Co-authored-by: Tim Brust <github@timbrust.de>
Co-authored-by: Norman Breau <norman@normanbreau.com>
Co-authored-by: エリス <erisu@users.noreply.github.com>
diff --git a/www/docs/en/dev/guide/platforms/android/index.md b/www/docs/en/dev/guide/platforms/android/index.md
index 1ae0c10..694bace 100644
--- a/www/docs/en/dev/guide/platforms/android/index.md
+++ b/www/docs/en/dev/guide/platforms/android/index.md
@@ -95,6 +95,13 @@
 1. Android Platform SDK for your targeted version of Android
 1. Android SDK build-tools version 29.0.2 or higher
 
+#### Android SDK Tools:
+In Android Studio 3.6 or later, you need to manually add the old version of the Android SDK Tools. To do this:
+
+1. Open the Android Studio **SDK Manager**
+2. In the Android **SDK Tools** tab, uncheck `Hide Obsolete Packages`
+3. Check `Android SDK Tools (Obsolete)`
+
 See Android's documentation on [Installing SDK Packages](https://developer.android.com/studio/intro/update)
 for more details.