Clarify that `tools.go` in Installation is an example for user projects

In README.md -> Installation -> Compile from source, the documentation shows an example Go file with build tags and blank imports. This file is commonly named tools.go.

As a new user, I initially looked for tools.go in this repository and was confused because it does not exist.

Could the README clarify that this file should be created in the user's own Go module/project, and is not expected to already exist in this repository?

For example, adding a sentence like:

"Create a tools.go file in your own module to track these tool dependencies."

This would make the installation steps clearer for beginners.