Added game engines, blogs and libraries

[emanzione]

Enriched the Go section with:

• 1 library
• 1 game engine

Enriched the C# section with:

• 1 library

Enriched the Blog Posts section with:

• 1 blog

Enriched the Game Engines section with:

• 8 C++ engines
• 1 Zig engine
• 1 Rust engine

Added the Physics libraries section:

• 1 C++ framework

[emanzione]

Merge conflicts resolved, it's safe to merge now.