Add orbclient example recipe

recipes/orbclient/recipe.sh

+
+GIT=https://gitlab.redox-os.org/redox-os/orbclient.git
+CARGOFLAGS="--example simple"
+
+function recipe_stage {
+    dest="$(realpath $1)"
+    mkdir -pv "$dest/bin"
+    cp -v "target/${TARGET}/release/examples/simple" "$dest/bin/orbclient"
+    skip=1
+}