Enable a textfield on click of checkbox in angularjs

I am very new to angularjs, i will brief you out what i should achieve

1. 
   

   there are three items in a web page, (i) Checkbox (ii) Textbox 1 (iii) Textbox 2

   
   


2. 
   

   Textbox 1 is always read only with some text in it

   
   


3. 
   

   on clicking the checkbox, textbox 2 should be editable which is intially readonly and has the text same as that in textbox 1

   
   

I have to do it in angularjs

please help