Add rustual-boy recipe

recipes/rustual-boy/recipe.sh

+GIT=https://github.com/xtibor/rustual-boy.git
+BRANCH=redox
+
+function recipe_update {
+    cd rustual-boy-cli
+}
+
+function recipe_build {
+    cd rustual-boy-cli
+}
+
+function recipe_stage {
+    mv rustual-boy-cli/target target
+}