Add the requirement info to the readme

README.org

@@ -5,6 +5,10 @@ project is to provide the API necessary to create an integrated editor.
 
 So you need to know about Emacs in advance.
 
+** Requirements
+In order to use *FG42* you need *Emacs >= 27.1* and the =texinfo= package. If you're on a
+debian based distro you can install it using =apt install texinfo=.
+
 ** Install from source
 In order to install *FG42*, issue the following commands:
 

config/fg42.user.el

@@ -69,6 +69,7 @@
 (require 'cubes/terraform)
 (require 'cubes/graph)
 
+
 (defvar global-font-size 12)
 
 (custom-set-faces