Adding String to Beginning of Lines

[Christopher Dimech]

I have a paragraph and want to add a string to the beginning of each line after 
selecting
the paragraph region.

GNU is an operating system that is free software—that is, it respects users' 
freedom. The
GNU operating system consists of GNU packages (programs specifically released 
by the GNU 
Project) as well as free software released by third parties. The development of 
GNU made
it possible to use a computer without software that would trample your freedom.

Example, passing ';; + ' as argument to a function to get

;; + GNU is an operating system that is free software—that is, it respects 
users' freedom. The
;; + GNU operating system consists of GNU packages (programs specifically 
released by the GNU 
;; + Project) as well as free software released by third parties. The 
development of GNU made
;; + it possible to use a computer without software that would trample your 
freedom.