Added more Developer Resources.

Added NixOS Tools.

README.md

@@ -136,6 +136,12 @@
  
  - [What Is Nix — Developer Tooling | Shopify Engineering](https://shopify.engineering/what-is-nix)
  
+ - [NixOS configurations collection](https://nixos.wiki/wiki/Configuration_Collection)
+ 
+ - [Install and Configure NixOS on a Linode](https://www.linode.com/docs/guides/install-nixos-on-linode/)
+ 
+ - [Zero to Nix from Determinate Systems](https://zero-to-nix.com/start/install)
+
  - [Cheatsheet - NixOS Wiki](https://nixos.wiki/index.php?title=Cheatsheet&useskin=vector)
  
  - [nix.dev guide for developers](https://nix.dev/)
@@ -327,6 +333,12 @@
  
  - [NixOS on WSL](https://github.com/nix-community/NixOS-WSL) is a minimal root filesystem for running NixOS on WSL. It can be used with DistroLauncher as ```install.tar.gz``` or as input to ```wsl --import --version 2```.
  
+ - [Appvm](https://github.com/jollheef/appvm) is a simple application VMs (hypervisor-based sandbox) based on Nix package manager. It uses one read-only /nix directory for all appvms. So creating a new appvm (but not first) is just about one minute.
+
+ - [Deadnix](https://github.com/astro/deadnix) is a tool that scan ```.nix``` files for dead code (unused variable bindings).
+
+ - [nix2container](https://github.com/nlewo/nix2container) isa tool that provides an efficient container development workflow with images built by Nix: it doesn't write tarballs to the Nix store and allows to skip already pushed layers (without having to rebuild them).
+
 ## NixOS Desktop
 [Back to the Top](https://github.com/mikeroyal/NixOS-Guide#table-of-contents)