Feature/setup

[LordofGhost]

This pull request sets up the foundational structure for the Messenger project, establishing both the client and server applications, integrating the RSA encryption library as a submodule, and providing initial build and documentation support. The client is built with Qt/QML, and the server is a terminal application. The project is configured for C++20 and uses CMake for building.

The most important changes are:

Project Structure and Build System:

• Added CMakeLists.txt files to define the project, enforce C++20, and organize the build into lib, src, client, server, and shared subdirectories. [1] [2] [3] [4]
• Integrated the RSA encryption library as a git submodule and ensured it is included in the build process. [1] [2] [3]

Client Application:

• Implemented the initial Qt/QML client with a singleton client class, a minimal Main.qml UI, and application startup logic. [1] [2] [3]

Server Application:

• Added a basic terminal server with a singleton server class and simple startup/shutdown messages. [1] [2]

Documentation:

• Expanded the README.md to describe the architecture, dependencies, setup instructions, and build process, including a mermaid diagram for dependencies.

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