docs: add README badges and initial usage

nix-community / nix-ts-mode

An Emacs major mode for editing Nix expressions, powered by tree-sitter [maintainer=@remi-gelinas]

https://github.com/nix-community/nix-ts-mode

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Closed remi-gelinas closed 1 year ago

remi-gelinas commented 1 year ago

Add the initial MELPA and trunk test workflow badges to the README along with the initial usage explanation.