Move dead submodules in-tree

Signed-off-by: swurl <swurl@swurl.xyz>

externals/oboe/apps/OboeTester/docs/README.md

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+# OboeTester Documentation
+
+OboeTester is an app that can be used to test many of the features of Oboe, AAudio and OpenSL ES.
+It can also be used to test Android devices, measure latency and glitches, etc.
+
+OboeTester can be run as an interactive app.
+It can also be run as part of an [automated test using Intents](AutomatedTesting.md)
+
+## Install OboeTester
+
+You have two options:
+1) Download OboeTester from the [Play Store](https://play.google.com/store/apps/details?id=com.mobileer.oboetester)
+2) OR [build the latest version of OboeTester using Android Studio](Build.md)
+
+## [How to Use OboeTester Interactively](Usage.md)
+
+## [Automated Testing with OboeTester](AutomatedTesting.md)
+
+-- [Privacy Policy](PrivacyPolicy.md) --