I am creating a Page to add multiple contacts to an Account. The Page is Called by a Button Click on Account Detail Page.'
For now, Contacts are getting Created however, they are not getting Associated to Account.

VISUALFORCE PAGE ---------

<apex:page name="Create Multiple Contacts" controller="AddMultipleContacts" showHeader="true" sidebar="true">        
    <apex:form >    
    <apex:pageBlock title="Add Contacts">
        <apex:variable var="rowNum" value="{!0}"/>
        <apex:pageBlockTable value="{!ContactList}" var="con">
            <apex:facet name="footer">               
                <apex:commandButton value="Add" style="float: right;" action="{!insertRow}" />                    
             </apex:facet>
            <apex:column headerValue="First Name">
                <apex:inputField value="{!con.FirstName}"/>
            </apex:column>
            
            <apex:column headerValue="Last Name">
                <apex:inputField value="{!con.LastName}"/>
            </apex:column>
            <apex:column headerValue="Phone">
                <apex:inputField value="{!con.Phone}"/>
            </apex:column>
            <apex:column headerValue="Email">
                <apex:inputField value="{!con.Email}"/>                
            </apex:column>
            
             <apex:column headerValue="Action" >
                    <apex:commandLink style="font-size:12px; font-weight:bold; text-align:center;color:Black;" value="Delete" action="{!delRow}">
                    <apex:param value="{!rowNum}" name="index" />
                    </apex:commandLink> 
                    <apex:variable var="rowNum" value="{!rowNum+1}"/>
             </apex:column> 
         </apex:pageBlockTable>
            <apex:commandButton value="Cancel" onclick="window.history.previous()"/>
            
            <apex:pageBlockButtons location="bottom" >
                <apex:commandButton value="Save Contacts" action="{!insertContacts}"/>           
            </apex:pageBlockButtons>
    </apex:pageBlock>
    </apex:form>        
</apex:page>

CONTROLLER ---------

public class AddMultipleContacts {
    Id AcctID;
    public List<Contact> ContactList {get;set;}
    public Integer rowNum{get;set;}
    
    public AddMultipleContacts(){
        AcctID = ApexPages.currentPage().getParameters().get('AcctID');
        ContactList = new List<Contact>();  
        ContactList.add(new contact());        
    }        
    public void insertContacts(){
        insert ContactList;
    }                    
    public void insertRow(){
        ContactList.add(new contact()); 
    }    
    public void delRow(){
        rowNum = Integer.valueOf(apexpages.currentpage().getparameters().get('index'));
        ContactList.remove(rowNum);   
    }        
}