Added merge-pdf

merge-pdf/README.md

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+## Merge readme
+
+Just a simple command line tool to merge multiple pdf files
+
+#### Requirements
+
+- `ghostscript`

merge-pdf/merge-pdf.sh

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+#!/bin/bash
+
+while getopts ":o:output:" opt; do
+  case $opt in
+      o | output)
+        output=$OPTARG
+        ;;
+      *)
+        echo "Unsupported argument was given (only '-o' is allowd)"
+        exit 1
+        ;;
+    esac
+done
+shift $((OPTIND -1))
+
+
+if [ -z $output ]; then
+    echo "An output must be provided ('-o' flag)"
+    exit 1
+fi
+
+gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=$output "${@}"