Add protobuf package definition

README.org

@@ -1484,6 +1484,7 @@ let
       <<emacs-python-package>>
       <<emacs-rustic-package>>
       <<emacs-plantuml-package>>
+      <<emacs-protobuf-package>>
       <<emacs-swiper-package>>
       <<emacs-desktop-package>>
       <<emacs-doom-themes-package>>
@@ -2697,6 +2698,13 @@ The built in Python Mode[fn:78] has a nice feature set for working with Python[f
     (turn-on-pretty-mode)))
 #+END_SRC
 
+** Protobuf Mode
+
+#+NAME: emacs-protobuf-package
+#+BEGIN_SRC nix
+epkgs.protobuf-mode
+#+END_SRC
+
 ** PlantUML
 
 #+NAME: emacs-plantuml-extras

modules/emacs.nix

@@ -47,6 +47,7 @@ let
       epkgs.pretty-mode
       epkgs.rustic
       epkgs.plantuml-mode
+      epkgs.protobuf-mode
       epkgs.ivy
       epkgs.counsel
       epkgs.ivy-rich