Best approch to read text file using C# with Desing patterns [closed]

I need a good design to implement a text file reader,

Suppose, In my application, I have the following config file as a JSON file.

[
   {
      "file_path":"/home/abc/textfile1.log",
      "app_name":"textfile1",
      "users":[
         {
            "name":"RTS",
            "email":"RTS@example.com",
            "phone":"789",
            "notificationTypes":"email,sms"
         },
         {
            "name":"XYZ",
            "email":"XYZ@example.com",
            "phone":"456",
            "notificationTypes":"email"
         }
      ]
   },
   {
      "file_path":"/home/pqr/textfile2.log",
      "app_name":"textfile2",
      "users":[
         {
            "name":"ABC",
            "email":"ABC@example.com",
            "phone":"123",
            "notificationTypes":"email,sms"
         }
      ]
   }
]

This application should able to read separate log files. According to the above JSON, there are two text files called textfile1 and textfile2. what I need to do is, suppose each log file, text content consists as follows,

2010-12-10 ERROR Test
2010-12-10 WARNING Test
2010-12-10 VERBOSE Test
2010-12-10 WARNING Test
2010-12-10 ERROR Test

once the application reading the text file, if there is an error log, I need to send the error message to a particular user.

as example,

   {
      "file_path":"/home/pqr/textfile2.log",
      "app_name":"textfile2",
      "users":[
         {
            "name":"ABC",
            "email":"ABC@example.com",
            "phone":"123",
            "notificationTypes":"email,sms"
         }
      ]
   }

once app reading the textfile2 and if there is any error log, I need to send an error message to email and phone, I need a good design to resolve this problem. How can I apply SOLID principles here, can anyone suggest me a good design by sample pseudo-code or class diagram.