add readme

Author: ousenko

README.md

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+# Android CI Runner Docker Image
+
+Image to be used for building Android apps on CI, e.g. GitLab CI.
+
+Image is Based on Ubuntu 16.04.
+
+## Tools installed
+
+- Android SDK Tools (26.0.1), Platform-tools, Build tools (26.0.2)
+- android-26 target
+- Android Support Library, revision 23.2.1
+- Android Support Repository
+- Google Repository
+- git
+- unzip
+- curl
+
+## Further development
+
+Add emulator support
+
+## License
+
+[MIT license](https://github.com/ousenko/android-ci-image/blob/master/LICENSE)