feat: Add read_from_txt method to Student class

- Introduced read_from_txt method in Student class to read student data from a text file.

lab2/student.rb

@@ -42,6 +42,26 @@ class Student < Person
       )
     end
 
+    def self.read_from_txt(file_path)
+        raise IOError, "File path is invalid or file does not exist: #{file_path}" unless File.exist?(file_path)
+    
+        students = []
+    
+        File.foreach(file_path) do |line|
+          line.strip!
+          next if line.empty? # Пропустить пустые строки
+    
+          begin
+            student = from_string(line)
+            students << student
+          rescue ArgumentError => e
+            puts "Error processing line: '#{line}'. Reason: #{e.message}"
+          end
+        end
+    
+        students
+    end
+  
     def surname_and_initials
       "#{@surname} #{name[0]}.#{patronymic[0]}."
     end