Multiple image upload and preview

I am learning how to upload multiple images and showing their preview...

I came across the following code

<html>
<head>
<style>
.input-file-row-1:after {
content: ".";
display: block;
clear: both;
visibility: hidden;
line-height: 0;
height: 0;
}

.input-file-row-1{
display: inline-block;
margin-top: 25px;
position: relative;
}

#preview_image {
display: none;
width: 90px;
height: 90px;
margin: 2px 0px 0px 5px;
border-radius: 10px;
}

.upload-file-container { 
position: relative; 
width: 100px; 
height: 137px; 
overflow: hidden;   
background: url('images/picplus.png') top center no-repeat;
float: left;
margin-left: 23px;
} 

.upload-file-container-text{
font-family: Arial, sans-serif;
font-size: 12px;
color: #719d2b;
line-height: 17px;
text-align: center;
display: block;
position: absolute; 
left: 0; 
bottom: 0; 
width: 100px; 
height: 35px;
}

.upload-file-container-text > span{
border-bottom: 1px solid #719d2b;
cursor: pointer;
}

.one_opacity_0 {
opacity: 0;
height: 0;
width: 1px;
float: left;
}
</style>
<script>
function readURL(input,target)
{
if(input.files && input.files[0])
{
var reader=new FileReader();
var image_target=$(target);
reader.onload=function(e)
{
    image_target.attr('src',e.target.result).show();
};
reader.readAsDataUrl(input.files[0]);
}
}

$("patient_pic").live("change",function(){
readURL(this,"#preview_image")
});
</script>

</head>

<body>
<form name="" method="post" action="#" class="feedback-form-1">
<fieldset>
    <div class="input-file-row-1">
        <div class="upload-file-container">
            <img id="preview_image" src="#" alt="" />
            <div class="upload-file-container-text">
                <div class = 'one_opacity_0'>
                    <input type="file" id="patient_pic" label = "add" />
                </div>
                <span> Add Photo </span>
            </div>

<div class="upload-file-container-text">
                <div class = 'one_opacity_0'>
                    <input type="file" id="patient_pic" label = "add" />
                </div>
                <span> Add Photo </span>
            </div>
    
</div>
    </div>
</fieldset>
</form>
</body>

</html>

I came across this JS Fiddle which explains it perfectly to me. But being a beginner I know it includes a jQuery library which clearly shows in framework extension of Fiddle. Now my issue is, how should I include it when I start the coding on my machine?

What will be included in the head (<script src="???">) section to make a call to the library?