docs: add build status badge and update license badge

Author: d3m37r4

README.md

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 [![RU](https://img.shields.io/badge/%F0%9F%87%B7%F0%9F%87%BA%20RU-inactive?style=flat-square)](README.ru.md#ru)
 
 [![Latest Release](https://img.shields.io/github/v/release/d3m37r4/ZemaxDDEClient?include_prereleases&style=flat-square&color=blue)](https://github.com/d3m37r4/ZemaxDDEClient/releases)
-[![License: MIT](https://img.shields.io/badge/License-MIT-green?style=flat-square)](https://github.com/d3m37r4/ZemaxDDEClient/blob/main/LICENSE)
+[![Build Test](https://img.shields.io/github/actions/workflow/status/d3m37r4/ZemaxDDEClient/.github%2Fworkflows%2Fbuild-test.yml?branch=main&style=flat-square&label=build%20test)](https://github.com/d3m37r4/ZemaxDDEClient/actions/workflows/build-test.yml)
+[![License](https://img.shields.io/github/license/d3m37r4/ZemaxDDEClient?style=flat-square)](https://github.com/d3m37r4/ZemaxDDEClient/blob/main/LICENSE)
 
 ## 📌 About
 An application for [Zemax](https://en.wikipedia.org/wiki/Zemax) that enables advanced analysis of optical systems through direct access to their parameters via DDE (Dynamic Data Exchange).

README.ru.md

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 [![RU](https://img.shields.io/badge/%F0%9F%87%B7%F0%9F%87%BA%20RU-blue?style=flat-square)](#ru)
 
 [![Latest Release](https://img.shields.io/github/v/release/d3m37r4/ZemaxDDEClient?include_prereleases&style=flat-square&color=blue)](https://github.com/d3m37r4/ZemaxDDEClient/releases)
-[![License: MIT](https://img.shields.io/badge/License-MIT-green?style=flat-square)](https://github.com/d3m37r4/ZemaxDDEClient/blob/main/LICENSE)
+[![Build Test](https://img.shields.io/github/actions/workflow/status/d3m37r4/ZemaxDDEClient/.github%2Fworkflows%2Fbuild-test.yml?branch=main&style=flat-square&label=build%20test)](https://github.com/d3m37r4/ZemaxDDEClient/actions/workflows/build-test.yml)
+[![License](https://img.shields.io/github/license/d3m37r4/ZemaxDDEClient?style=flat-square)](https://github.com/d3m37r4/ZemaxDDEClient/blob/main/LICENSE)
 
 ## 📌 О проекте
 Приложение для работы с [Zemax](https://en.wikipedia.org/wiki/Zemax), обеспечивающее расширенный анализ оптических систем за счёт прямого доступа к их параметрам через DDE (Dynamic Data Exchange).