Organized the plugin structure. Added initial documentation

doc/vim-combo.txt

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+      .__                                      ___.           
+___  _|__| _____             ____  ____   _____\_ |__   ____  
+\  \/ /  |/     \   ______ _/ ___\/  _ \ /     \| __ \ /  _ \ 
+ \   /|  |  Y Y  \ /_____/ \  \__(  <_> )  Y Y  \ \_\ (  <_> )
+  \_/ |__|__|_|  /          \___  >____/|__|_|  /___  /\____/ 
+               \/               \/            \/    \/        
+
+Each keystroke in insert mode increases your combo, but not typing for 1 second resets it.
+Hacks are not patched around : you can keep a key pressed to increase your combo, and CTRL+SHIFT+V will all be counted as a combo.
+
+Best score is displayed next to the current combo in square brackets. When a new high score is achieved, it is saved inside .vim as .combo.
+If you get errors at launch, check that .combo exists and has just a number inside (should be 0, or last best combo).
+
+The plugin is still under construction. Right now, you will need to edit the path to the .combo file and choose where to display the combo information.
+By default, the section B of airline-vim is overwritten to display current combo. A random Runic character has been chosen to indicate the combo field.

plugin/vim-combo.vim

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+" COMBO Counter
+let g:combo_counter = 0								" The actual combo variable
+let g:best_combo = readfile('/home/$USER/.vim/.combo')				" ~ is not expanded ???
+let g:best_combo = g:best_combo[0]						" Reading from file returns a list, but an int is needed
+let g:last_combo = reltime()							" Set current time as last combo time
+let g:airline_section_b = 'ᛥ %{g:combo_counter} [%{g:best_combo}]'		" I use airline vim and inserted the combo meter in it
+function! UpdateCombo()
+  if reltimefloat(reltime(g:last_combo)) > 1					" Timeout is 1 second
+	  if g:combo_counter > g:best_combo					" Before resetting combo counter, check if new high score
+		call writefile([g:combo_counter], "/home/$USER/.vim/.combo")
+		let g:best_combo = g:combo_counter
+	  endif
+	  let g:combo_counter = 1
+  else
+	  let g:combo_counter +=1 
+  endif
+  let g:last_combo = reltime()
+endfunction
+autocmd CursorMovedI * call UpdateCombo()					" Every time the cursor moves, call combo function