Add a .editorconfig file
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit bcb1176ec6f17538ffff94d2fbd21579938c3c05
    Author: Kairui Song <kasong@redhat.com>
    Date:   Fri Jul 30 01:08:30 2021 +0800
    
        Add a .editorconfig file
    
        EditorConfig file is helpful for tools like `shfmt`, also could be a
        hint for code styling.
    
        The code style spec used in this new added .editorconfig file is
        generated based on existing code style.
    
        Following commits will make mkfadumprd, mkdumprd, kdumpctl, kdump-lib.sh,
        and *-module-setup.sh only be used in first kernel, so use bash syntax
        for these scripts. Other scripts will use sh syntax for better POSIX
        compatibility.
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
        Acked-by: Pingfan Liu <piliu@redhat.com>
        Acked-by: Philipp Rudo <prudo@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>