add build badge

Author: baev

README.md

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 # Allure Codeception Adapter
 
+[![Build](https://github.com/allure-framework/allure-codeception/actions/workflows/build.yml/badge.svg)](https://github.com/allure-framework/allure-codeception/actions/workflows/build.yml)
+
 This is an official [Codeception](http://codeception.com) adapter for Allure Framework.
 
 ## What is this for?