Need Guidance in Creating Mobile Website that looks and acts like an app, but is really just a mobile website.

I want to create a mobile web site with a responsive design and call it an "App" without actually creating a "native(?)" app. I'm not familiar with programming an app, but I'm a wiz at PHP. So I really want to build a responsive site and use php/mysql for its functions. So I'm hoping there is a quick work-around versus actually programming everything in android/iphone code. Instead I just need an App Icon that accesses the web site which can sit on the home screen just like other apps icons (versus a bookmark).

Also, one important aspect to this is that the user can easily "download" the app to put the icon on their home screen.

So I'm thinking of these possible solutions which I have no idea how to do either and I'm having a hard time finding any answers by searching google, which I'm usually really good at, but with lack of time to spare I surrender to the experts!

1) Create an APP that "iframes" in the web site. So the app is kind of just the container for the web site.

or

2) Simply create an APP Icon and make it open the browser window to my web site "m.mysite.com"

3) ??? is there a better way? Any other Ideas?

I really appreciate your help experts!!!

Tony