manifest.html

<!-- Add to homescreen for Chrome on Android -->
<meta name="mobile-web-app-capable" content="yes">
<link rel="icon" sizes="192x192" href="<!-- a touch icon -->">
<meta name="theme-color" content="<!-- status bar color -->">

<!-- Add to homescreen for Safari on iOS -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="<!-- status bar color -->">
<meta name="apple-mobile-web-app-title" content="<!-- application name short -->">

<link rel="apple-touch-icon" href="<!-- iphone image -->">
<link rel="apple-touch-icon" sizes="76x76"  href="<!-- ipad image -->>">
<link rel="apple-touch-icon" sizes="120x120" href="<!-- iphone retina image -->">
<link rel="apple-touch-icon" sizes="152x152" href="<!-- ipad retina image -->">

<!-- Tile icon for Win8 -->
<meta name="application-name" content="<!-- application name short -->">
<meta name="msapplication-square70x70logo" content="<!-- windows image -->">
<meta name="msapplication-square150x150logo" content="<!-- windows image -->">
<meta name="msapplication-square310x310logo" content="<!-- windows image -->">
<meta name="msapplication-navbutton-color" content="#000000">
<meta name="msapplication-tooltip" content="Start <!-- app name --> ">
<meta name="msapplication-starturl" content="./"> <!-- or maybe dashboard or main? -->

<!-- Tile icon for IE10 on Win8 (144x144 + tile color) -->
<meta name="msapplication-TileImage" content="<!-- windows image -->">
<meta name="msapplication-TileColor" content="<!-- theme color -->">

<link rel="manifest" href="/manifest.json">

For manifest.json see developers.google.com