nix realisation info: Description and Examples

1st chunk of `src/nix/realisation/info.md`

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# Description

Display some information about the given realisation

# Examples

Show some information about the realisation of the `hello` package:

```console
$ nix realisation info nixpkgs#hello --json
[{"id":"sha256:3d382378a00588e064ee30be96dd0fa7e7df7cf3fbcace85a0e7b7dada1eef25!out","outPath":"fd3m7xawvrqcg98kgz5hc2vk3x9q0lh7-hello"}]
```

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Title: nix realisation info: Description and Examples

Summary

This section describes the `nix realisation info` command, which displays information about a given Nix realisation. An example is provided showing how to use the command to get information about the realisation of the `hello` package, with the output in JSON format.