Created Building for Android (markdown)

Building-for-Android.md

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+## Note: These build instructions are a work-in-progress.
+### Dependencies
+* [Android Studio](https://developer.android.com/studio)
+* [NDK and CMake](https://developer.android.com/studio/projects/install-ndk#default-version)
+* [Git](https://git-scm.com/download)
+### Cloning Citra with Git
+```
+git clone --recursive https://github.com/citra-emu/citra.git
+```
+Citra by default will be cloned into -
+* `C:\Users\<user-name>\citra` on Windows
+* `~/citra` on Linux
+* And wherever on macOS
+### Building
+1. Start Android Studio, on the startup dialog select `Open`.
+2. Navigate to the `citra/src/android` directory and click on `OK`.
+3. In `Build > Select Build Variant`, select `release` or `relWithDebInfo` as the "Active build variant".
+4. Build the project with `Build > Make Project` or run it on an Android device with `Run > Run 'app'`.
+
+### Additional Resources
+https://developer.android.com/studio/intro
+
+