docs: Add basic README

Author: avast-scala-builder

README.md

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+# Scala Server Toolkit
+
+This project is a culmination of years of Scala development at Avast and tries to represent the best practices of Scala server development 
+we have gained together with tools that allow us to be effective. It is a set of small, flexible and cohesive building blocks that fit 
+together well and allow you to build reliable server applications.
+
+## Design
+
+There are certain design decisions and constraints that are put in place to guide the development of the toolkit and recommended for 
+the development of your server applications.
+
+* Keep the number of dependencies as low as possible.
+* Modular design: small, cohesive, orthogonal and composable components.
+* Functional programming.
+* Type safe configuration and resource lifecycle.
+* No need for dependency injection.
+* [Scalazzi Safe Scala Subset](https://slides.yowconference.com/yowwest2014/Morris-ParametricityTypesDocumentationCodeReadability.pdf)
+
+## Issues
+
+Please report issues to [GitHub](https://github.com/avast/scala-server-toolkit/issues).
+
+## License
+
+Scala Server Toolkit is licensed under [MIT License](LICENSE).