first basic implementation

README.md

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+# promise.hpp
+
+[![language][badge.language]][language]
+[![license][badge.license]][license]
+[![paypal][badge.paypal]][paypal]
+
+[badge.language]: https://img.shields.io/badge/language-C%2B%2B14-red.svg?style=for-the-badge
+[badge.license]: https://img.shields.io/badge/license-MIT-blue.svg?style=for-the-badge
+[badge.paypal]: https://img.shields.io/badge/donate-PayPal-orange.svg?logo=paypal&colorA=00457C&style=for-the-badge
+
+[language]: https://en.wikipedia.org/wiki/C%2B%2B14
+[license]: https://en.wikipedia.org/wiki/MIT_License
+[paypal]: https://www.paypal.me/matov
+
+[promise]: https://github.com/BlackMATov/promise.hpp
+
+## Installation
+
+[promise.hpp][promise] is a single header library. All you need to do is copy the header file into your project and include this file:
+
+```cpp
+#include "promise.hpp"
+```
+
+## [License (MIT)](./LICENSE.md)