docs: add NixOS installation instructions to README

[ob7]

Add NixOS package installation section under a new "Package Managers" category in the installation instructions. This reflects tenere's recent addition to nixpkgs (NixOS/nixpkgs/pull/363556)

Resolves #43

[ob7]

hmm .. just realized crates is considered a "package manager" so perhaps I need a different title than one I used here ...
I'll change the section I added called "Package Managers" to "System Package Managers"

[ob7]

or maybe we don't even need a section for system package managers if nixos is only one and other distros probably just use crates? I'll remove the part that adds a new section and just put nixos section directly beneath crates section.

[pythops]

Can it be installed like this ?

nix-env -iA nixpkgs.tenere

[ob7]

Any of the Nix install methods should work, however its only available in master until I backport it to a stable release like 24.11, 24.05, etc.

So thinking about it, even though tenere is in nixpkgs now, maybe hold off merging this until it's in one of the main release branches so that most ppl using nixos/nixpkgs will actually see it show up for them. As of now one needs to clone the nixpkgs repo and install it using the master branch. It's not yet visible in any of the channels.

[ob7]

@pythops The backport to nixpkgs release-24.11 should work out the box, but for backport to release-24.05 I need to downgrade the cargo.lock to version 3: NixOS/nixpkgs#364671 Any objections?

[pythops]

You are the maintainer of the nixpackage 😄 You do what you think is right buddy :)

[ob7]

I wanted to make sure you weren't aware of any issues running tenere using deps generated for cargo.lock v3. I'll assume not, I just like to be thorough

[pythops]

not that I know no.

[ob7]

@pythops - tenere has been successfully backported to nixos release-24.11 (NixOS/nixpkgs#364564). It can now be installed via normal release channels, as well as via nix-env -iA nixpkgs.tenere on non-nixos systems running nixpkgs! I tested on debian.

I still have a PR opened for backport to release-24.05 (NixOS/nixpkgs#364671) for ppl running older version.

[pythops]

maybe you can have it in multiple lines, Something like

Or as following for Non-NixOs systems
\```
nix-env -iA nixpkgs.tenere
\```

[ob7]

Hows this?:

tenere/README.md

Lines 56 to 59 in 927571c

	For non-NixOS systems, install directly with:
	```nix
	nix-env -iA nixpkgs.tenere
	```

[pythops]

Thanks buddy for the PR and the work done to add support for nix 🙏