Update README.md

Author: warnyul

README.md

@@ -1,2 +1,25 @@
 # dependabot-android-gradle
-A Proof of Concept repo to test how dependabot can handle the dependencies from maven.google.com
+
+A Proof of Concept repo to test how [Dependabot](https://github.com/dependabot) can handle the dependencies from
+https://maven.google.com
+
+## Problem
+
+We wanted to use Dependabot on an Android Gradle project. The problem is that Dependabot is only
+checking https://repo.maven.apache.org for version updates with the [default configuration][dependabot-default-config].
+However on an Android project needs a lots of dependencies which are provided by Google.
+
+## Idea
+
+Configure dependabot to be able to scan for dependencies in [https://maven.goolge.com](https://maven.goolge.com).
+
+## Result
+
+Dependabot will check for updates if a [maven registry][dependabot-registries] set up
+in [dependabot.yml][dependabot-google-config].
+
+[dependabot-default-config]: https://github.com/apter-tech/dependabot-android-gradle/commit/e200e9284fc7205e8e21c4bb36feefe414d5bd27
+
+[dependabot-google-config]: https://github.com/apter-tech/dependabot-android-gradle/commit/9d8cc6f8152b494d761f296245859faf25a7a5ed
+
+[dependabot-registries]: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#registries