Create "+ Button" for dynamic extra fields

I'm using espocrm script and In that script I need you to modify some .json, .js , and .tpl files and maybe other files if you think so, in order to have "dynamic extra fields" that will be "+ Button" that will it allow me to add extra fields when I click the "+ button" and all this data should be stored in the database. In order to get this job done, you need to download and install the script on your local server from this link [login to view URL] Once you have installed the script then I will send you a rare file and screenshots of files that you will need to modify to make your job easier. I will also help you with videos to show you what exactly do I want you to do. This 1:16 min video will explain your task in details [login to view URL] This 4 mins video will show you how to create fields and display new fields in the frontend [login to view URL] When you contact me, you will need to tell me the following: Your fixed price to get this task done When can you deliver the finished task Thank you