A flake example for a nix-on-droid configuration should be added

[573]

Is your feature request related to a problem? Please describe.
I'm using nixd for my nix-on-droid configuration as well (expr = (builtins.getFlake "/data/data/com.termux.nix/files/home/.nix-config").nixOnDroidConfigurations.sams9.options ) and it would be a nice addon to the existing ones flake-parts etc.

Describe the solution you'd like

• Use the template to create a sample config
• Add resulting flake.nix to new folder in the https://github.com/nix-community/nixd/tree/main/nixd/docs
• Add devShells.nvim-nix-on-droid etc. to the root flake
• Add above https://github.com/nix-community/nixd/blob/9355fa2/nixd/docs/editors/nvim-lsp.nix#L383 bespoke expr
• Extend https://github.com/nix-community/nixd/blob/9355fa2916fc0a9bd7266032e23ff579af77c65f/nixd/docs/editors/editors.md with description
• Same for vscodium

[inclyc]

it would be a nice addon to the existing ones flake-parts etc.

I'm glad to accept such PR, please do it!