Add support for non-Windows platforms

[THammami01]

It works well on Windows, however, the command that initializes the app's directories have to be altered in order to run on other operating systems.

Refer to these lines in main.Main:

    // ...

    public static final String appDir = "C:\\UVT-HICS\\ULMS\\";
    public static final String backupsDir = "C:\\UVT-HICS\\ULMS\\BackUps\\";

    // ...

    public static void initDirs() {
        try {
            String command = String.format("mkdir %s", backupsDir);
            Runtime.getRuntime().exec("cmd /c " + command);
        } catch (Exception e) {
            e.printStackTrace();
            e.getCause();
        }
    }

    // ...

[Sandeep-source]

Hey @THammami01 ,

You directly run mkdir dir_name command without cmd /c and it will work on almost all platforms.

Instead of using this:

Runtime.getRuntime().exec("cmd /c " + command);

Use this:

Runtime.getRuntime().exec(command);

[THammami01]

That's great, @Sandeep-source. I know it's so basic, but I wanted someone to fix it. You can make the necessary changes and then create a PR. 🥳