add asort.py script to sort items automatically.

auto_sort/README.md

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+# Introduction
+`asort.py` is a very simple python3 script that aims to make sure items in the README file of the repo [Awesome-Linux-Software](https://github.com/VoLuong/Awesome-Linux-Software) are sorted alphabetically.
+
+This script only sorts items in the following topics for now (items between topic Applications and topic Setup):
+- Applications
+- Command Line Utilities
+- Desktop Environments
+- Display Managers
+- Window Managers
+
+# Usage
+1. Add items to corresponding topics, don't worry about the order of those items.
+1. Make sure you've installed python3 environment on your system.
+1. Open a terminal, type `python3 asort.py` to run this script. After that, you'll get a new README file with all the items in the above topics being sorted alphabetically.
+
+[test screenshot](./test.png)
+
+# License
+MIT License.