i have custom sharepoint list and i have displayed this list on sharepoint webpage as a webpart.

Hello,

As i understand you want to add read more link for rest of items in listview webpart. You can create new view and set item limit in that view then add that list as webpart on webpart-->edit your webpart-->select view from view selection dropdpwn--> save it

Later add one CEWP and use html <a> tag to redirect to your main list when clicks on it. Here is the steps to do this:

http://ift.tt/1FqQfgg

You can also use Jquery/Javascript/ECMA script but above one is OOTB and easy solution

Hope it could help

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