[ADD][SHELL] Add rust environment to PATH

I share the `.share` file between Zsh and Bash so no need to add the
export to all files, only one will do.

shell/.profile

@@ -1,5 +1,5 @@
 # Add our scripts to the path
-PATH="$HOME/scripts:$PATH"
+export PATH="$HOME/scripts:$PATH"
 
 # Export our favorite editor
 export EDITOR=vim
@@ -25,3 +25,6 @@ export LESS_TERMCAP_so=$'\E[01;44;33m' # begin reverse video
 export LESS_TERMCAP_se=$'\E[0m'        # reset reverse video
 export LESS_TERMCAP_us=$'\E[1;32m'     # begin underline
 export LESS_TERMCAP_ue=$'\E[0m'        # reset underline
+
+# Rust installation
+export PATH="$HOME/.cargo/bin:$PATH"