add installer

install.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+echo
+dot_mt="$HOME/.minetest"
+if [ ! -d "$dot_mt" ]; then
+  echo "ERROR: Nothing done since no $dot_mt."
+  exit 1
+fi
+MT_MYGAME_MODS_PATH="$dot_mt/mods"
+MTMOD_DEST_NAME="nether"
+MTMOD_DEST_PATH="$MT_MYGAME_MODS_PATH/$MTMOD_DEST_NAME"
+flag_file="$MTMOD_DEST_PATH/init.lua"
+end_msg="Successfully installed to $MTMOD_DEST_PATH"
+if [ ! -d "$MTMOD_DEST_PATH" ]; then
+  mkdir -p "$MTMOD_DEST_PATH"
+fi
+if [ ! -f init.lua ]; then
+  cd "${0%/*}"
+  echo "WARNING: had to change directory to `pwd` since init.lua was not found..."
+fi
+
+if [ ! -f init.lua ]; then
+  echo "You are not in the nether mod, so install.sh failed."
+  exit 2
+fi
+cp -R * "$MTMOD_DEST_PATH"
+if [ ! -f "$flag_file" ]; then
+  end_msg="$MTMOD_DEST_PATH could not be installed ($flag_file not copied to destination)."
+fi
+echo "$end_msg"
+echo
+echo