If you use Eclipse you can open the workspace found in \mcp9xx\eclipse. You will have to correct the library path for the vanilla jar and realms jar, and also add libraries for JRift, json, asm, and ...
libGDX provides a simple wizard tool (gdx-setup.jar) allowing you to easily get started. This will create a gradle ready project, which can then be imported into your IDE (Android Studio, Eclipse..).
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