Add a Dockerfile

Dockerfile

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+FROM wiiuenv/devkitppc:20200625
+
+COPY --from=wiiuenv/libgui:20200626 /artifacts $DEVKITPRO
+
+WORKDIR project

README.md

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+## Building using the Dockerfile
+
+It's possible to use a docker image for building. This way you don't need anything installed on your host system.
+
+```
+# Build docker image (only needed once)
+docker build . -t launchiine-builder
+
+# make 
+docker run -it --rm -v ${PWD}:/project launchiine-builder make
+
+# make clean
+docker run -it --rm -v ${PWD}:/project launchiine-builder make clean
+```