Documentation | readme: Add build environment setup instructions for nixos (!218)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/218#note_151731


@prashantrahul141 fix the `mdformat` changes:

```
--- a/README.md
+++ b/README.md
@@ -662,6 +662,7 @@ if an update to any of the packages is required, the hash can be updated to
 a newer one.
 
 Create a `shell.nix` file with the folllowing content:
+
 ```nix
 { }:
 let

@@ -758,6 +759,7 @@ pkgs.mkShell {
   '';
 }
 ```
+
 Running `nix-shell` where the file is present would give an environment with everything configured.
 
 ### Latex Setup
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/218#note_151731
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