shop/template/admin/public/manifest.json

{
    "name":"CRMEB",
    "display":"standalone",
    "start_url":".",
    "id": "index.html",
    "background_color": "#999",
    "theme_color":"#292d3e",
    "icons":[{
        "src":"./image/logo-small.png",
        "sizes":"144x144",
        "type":"image/png"
    }]
}