Add a Dockerfile

Dockerfile

@@ -0,0 +1,5 @@
+FROM wiiuenv/devkitppc:20200625
+
+COPY --from=wiiuenv/wiiumodulesystem:20200625 /artifacts $DEVKITPRO
+
+WORKDIR project

README.md

@@ -16,6 +16,22 @@ Make you to have [wut](https://github.com/devkitPro/wut/) and [WiiUModuleSystem]
 make install
 ```
 
+## 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 setuppayload-builder
+
+# make 
+docker run -it --rm -v ${PWD}:/project setuppayload-builder make
+
+# make clean
+docker run -it --rm -v ${PWD}:/project setuppayload-builder make clean
+```
+
+
 ## Credits
 - maschell
 - Copy paste stuff from dimok