Google has a lot of documentation about this.
Just use:
<link rel="apple-touch-icon" href="apple-touch-icon.png"/>
<link rel="apple-touch-icon" href="apple-touch-icon-72.png" sizes="72x72"/>
<link rel="apple-touch-icon" href="apple-touch-icon-114.png" sizes="114x114"/>
As additional information , you can have an icon without a glitter effect if you use apple-touch-icon-precomposedinstead apple-touch-icon.
, , Safari Mobile, ..
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