Update README to document vcpkg manifest-based dependency workflow

[huytran088]

Motivation

• Move README dependency instructions from ad-hoc per-package commands to the manifest-based vcpkg workflow used by CI.
• Make it clear how minimum versions and exact resolved versions are controlled by vcpkg.json and the manifest baseline (builtin-baseline).
• Update OpenAL/OpenGL dependency wording to reflect current manifest entries and whether ALUT is required.
• Remove guidance that suggests manual include-path edits when vcpkg manifest integration already provides those paths.

Description

• Updated README.md External Dependencies list to match the manifest entries and show minimum versions (GLFW 3.3+, GLEW 2.1+, GLM 0.9.9+, OpenAL Soft 1.21+, Assimp 5.0+) and added a note that ALUT is not required.
• Rewrote the Dependencies Management section to describe vcpkg manifest mode and that dependencies are installed from repository root with a single manifest command (vcpkg install).
• Replaced per-package install examples with a manifest workflow example that runs vcpkg install --triplet x64-windows from the repo root and kept vcpkg integrate install for IDE integration.
• Reworded the OpenAL configuration note to state that include/library paths are provided automatically when vcpkg integration is enabled, removing the suggestion to perform ad-hoc include-path edits.

Testing

• Documentation-only changes; no code or build changes were introduced so no automated build/test runs were required.
• Verified the change locally by inspecting diffs (git diff) and committing the updated README.md.

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[chatgpt-codex-connector]

Restore ALUT as required dependency in README

The new dependency note says ALUT is not required, but the code still depends on ALUT APIs (<AL/alut.h>, alutInit, alutCreateBufferFromFile, alutExit) in the audio path (see GameEngine/SoundEngine.h, GameEngine/SoundEngine.cpp, and GameEngine/SoundSourceComponent.cpp). In environments that follow this README and install only the manifest-listed packages, this can produce missing-header or unresolved-symbol failures during build, so the dependency guidance is currently inaccurate until ALUT usage is removed or added to dependencies.

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