add checklist link to readme

readme.md

@@ -45,6 +45,8 @@ Create HTML page with form. On form submit send form data to `https://mate-acade
 - Vertical distance between blocks with inputs should be `20px`
 - Any other styles should be browser default
 
+--> Don't forget to proofread your code using [CHECKLIST](https://github.com/mate-academy/layout_html-form/blob/master/checklist.md)
+
 ## Tips & Hints
 1. You can group different input sections with [fieldset](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/fieldset) tag
 2. Make sure you have `method` and `action` attributes for form specified correctly