Addressing the issue of clear build and install instructions for majo…

[HappiProgrammer]

Implement GitHub issue #2559 in the Grin repository:

Clear Build and Install Instructions for each Major OS
Issue: #2559

First, inspect the repository and determine the current, correct build process. Pay particular attention to:

• doc/build.md
• README.md
• Cargo.toml
• rust-toolchain / rust-toolchain.toml, if present
• CI/workflow files
• Existing platform-specific documentation

Task

Improve doc/build.md so a new contributor can build and run Grin from source without having to search through the repository.

Organize the document into clear sections for the major operating systems that the repository actually supports, such as:

• Linux
• macOS
• Windows

For each supported OS, document:

1. Prerequisites and required system dependencies.
2. Rust/toolchain setup.
3. Repository cloning.
4. Building Grin.
5. Running Grin.
6. How to verify the build.
7. Relevant platform-specific notes or troubleshooting.

Use actual commands from the repository and make them copy-pasteable.

Also document:

• Debug/development builds vs release builds, where applicable.
• The actual Grin executable/binary name.
• Existing repository-supported tests or verification commands.
• Important build requirements.

Critical rules

• Do not guess or invent commands, dependencies, versions, or OS support.
• Use the repository's current configuration as the source of truth.
• Do not blindly copy outdated instructions from the GitHub issue.
• Preserve useful existing documentation.
• Keep the changes focused on issue Clear Build and Install Instructions for each Major OS #2559.
• Prefer changing only doc/build.md.
• Do not modify Rust source code.
• Do not modify Cargo configuration or CI.
• Do not add dependencies.
• Do not create unrelated documentation.

Before finishing

Review the final doc/build.md as if you were a first-time Grin contributor.

Verify that:

• Instructions are technically consistent with the repository.
• Commands are correct.
• Markdown formatting is clean.
• OS sections have a consistent structure.
• No unsupported platform is presented as supported.
• No unrelated files were modified.

Finally, show me:

1. Files changed.
2. A concise summary of the changes.
3. Any OS-specific limitations discovered.
4. Any commands that could not be verified.
5. A short explanation of how the changes satisfy issue Clear Build and Install Instructions for each Major OS #2559.

Do not make unrelated changes.

[ardocrat]

this command is rather for servers, at desktop users launch it with grin.

[ardocrat]

same as for Linux, users at desktop type grin, they can run using target/release/grin

[ardocrat]

you dont need to specify target at actual platform to launch just with target/release/grin/

[ardocrat]

at x86 this target is installed by default

[ardocrat]

Need to mention command grin to have TUI interface at desktop