Add info on how this extension works in readme

This patch adds information on how this extension works in the readme
allowing the user to understand the dependency tree with two extension
dependencies for the YAML and Lua LSP providers and about the LSP used
in the Lua extension.

Author: georgiy-belyanin

README.md

@@ -52,14 +52,14 @@ For more examples, refer to [the examples folder](examples/) with tutorials on h
 
 ## Contributing
 
-Feel free to open issues on feature requests, wrong type annotations and bugs. If you're dealing with the problem related to LSP we'd appreciate addressing a direct issue to [emmylua-analyzer-rust](https://github.com/CppCXY/emmylua-analyzer-rust) which is used as a language server.
+Feel free to open issues on feature requests, wrong type annotations and bugs. If you're dealing with a problem related to LSP we'd appreciate addressing a direct issue to [the used external Lua Language server](https://github.com/CppCXY/emmylua-analyzer-rust).
 
 We also appreciate contributions via pull requests.
 
 Thank you for your interest in Tarantool and its development tools!
 
 ## References & acknowledgments
 
-This is an extension for the [Tarantool database](https://www.tarantool.io/) internally using [VS Code EmmyLua extension as a language server](https://github.com/EmmyLua/VSCode-EmmyLua).
+This is an extension for the [Tarantool database](https://www.tarantool.io/). It uses [VS Code EmmyLua extension](https://github.com/EmmyLua/VSCode-EmmyLua) with [emmylua-analyzer-rust](https://github.com/CppCXY/emmylua-analyzer-rust) under the hood and [RedHat YAML extension](https://github.com/redhat-developer/vscode-yaml) dependencies as providers of Lua and YAML language servers and extend them with Tarantool-specific annotations.
 
 A lot of the initial work has been done by Tarantool community in the [original Tarantool VS Code annotations](https://github.com/vaintrub/vscode-tarantool).