added automatic time entry to README

README.md

@@ -14,6 +14,15 @@ Vim syntax file to imitate the syntax highting of Fast Log Entry (FLE).
 
 Because it's nice to take a small GNU/Linux based laptop with me on portable operations, just log everything with VIM and do the rest at home.
 
+## Extras
+
+You can insert the current time in UTC and HHMM format by pressing <F5> if you add the following lines to your .vimrc file:
+
+    # Insert current time in HHMM format with <F5>
+    let $TZ='UTC'
+    :nnoremap <F5> "=strftime("%H%M")<CR>P
+    :inoremap <F5> <C-R>=strftime("%H%M")<CR>
+
 ## Install
 
 Copy or symlink these files to your $VIMRUNTIME/syntax and $VIMRUNTIME/ftdetect directory or to