android: added README.md for notes and resources for MPD android maintainers.

Author: geneticdrift

android/README.md

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+# Android
+
+Notes and resources for MPD android maintainers.
+
+## Android studio
+
+### Version control
+
+* [How to manage projects under Version Control Systems (jetbrains.com)](https://intellij-support.jetbrains.com/hc/en-us/articles/206544839-How-to-manage-projects-under-Version-Control-Systems)
+  
+* [gradle.xml should work like workspace.xml? (jetbrains.com)](https://youtrack.jetbrains.com/issue/IDEA-55923)
+
+### Native libraries
+
+*  [Include prebuilt native libraries (developer.android.com)](https://developer.android.com/studio/projects/gradle-external-native-builds#jniLibs)
+
+