README: Provide info about changes w.r.t. original plugin

And do some tidying up while at it.

Signed-off-by: Sam Protsenko <[email protected]>

Author: joe-skb7

README.md

@@ -1,7 +1,8 @@
 # cscope-maps
 
 Just old good cscope maps plugin for vim, taken from [1]. Made a mirror just to
-use it in unified way with vim package manager.
+use it in unified way with vim package manager. This repository has some
+extra improvements on top of original plugin.
 
 ## Description
 
@@ -12,17 +13,31 @@ These key maps use multiple keystrokes (2 or 3 keys). If you find that vim keeps
 timing you out before you can complete them, try changing your timeout settings
 in plugin file.
 
+For more details please refer to [2].
+
+## Changes
+
+Next changes are made in this repository comparing to original plugin:
+
+* Add key binding to search for C structure (Ctrl-S), in case the structure is
+  defined using K&R style, e.g.: `struct abc {`
+* Use Ctrl-Space key binding to split vertically (as opposed to horizontal
+  split in original plugin). To split horizontally, use Ctrl-Space-Space.
+* If `cscope.out` file is missing in current directory, try to look for it
+  in upper directories
+* Fix some typos
+
 ## Installation
 
 * __vim 8__:  Stick this file in `~/.vim/pack/<dir>/start/cscope/plugin/`
               where `<dir>` is any arbitrary name. Lookup Vim8 packages
               for more details.
-
 * __vim 6__:   Stick this file in your `~/.vim/plugin` directory (or in a
               'plugin' directory in some other directory that is in your
               'runtimepath'.
-
 * __vim 5__:  Stick this file somewhere and 'source cscope.vim' it from
               your `~/.vimrc` file (or cut and paste it into your `.vimrc`).
 
 [1] http://cscope.sourceforge.net/cscope_maps.vim
+
+[2] http://cscope.sourceforge.net/cscope_vim_tutorial.html