title: Add a new client field to admin panel and manage it
body: <p>I'm new to Craft CMS and yii.  I just want to add a new (clients) field to craft 2 admin panel. This field must have the option to add edit delete a client, form fields are (name, account_id etc.). Currently, I'm following the tutorial <a href="https://docs.craftcms.com/v2/#who-it%E2%80%99s-for" rel="nofollow noreferrer">https://docs.craftcms.com/v2/#who-it%E2%80%99s-for</a>. How to build this, anyone knows please help me to solve this. If the custom plugins are the only way please give me some step by step procedure to solve this, thank you</p>
  
  <p>Now I'm trying to create a new custom plugin, but I don't know is that a right way to solve this issue</p>
  
  <p>Expecting some step by step procedure to solve this</p>