readme: add longer introduction

README.md

@@ -10,8 +10,9 @@ It's fast, highly configurable and well documented.
 Features:
 
 - supports git, mercurial, darcs, bazaar, subversion, cvs
+- quick jumping between changed lines
 - apart from signs there is also optional line highlighting
-- fully configurable through global variables
+- fully configurable through global variables (options and mappings)
 - optional preserving of signs from other plugins
 - you can toggle the plugin per buffer
 - exception lists for filetypes and filenames
@@ -23,6 +24,72 @@ Features:
 
 Limits exist only in your mind! Vim on!
 
+## Longer introduction
+
+`supports git, mercurial, darcs, bazaar, subversion, cvs`
+
+This plugin is based on the diffing features of the supported version control
+systems. Since not all VCS support the same options, sometimes we have to fall
+back to the 'diff' executable.
+
+Current the following VCS are supported:
+
+- git
+- mercurial (hg)
+- bazaar (bzr)
+- darcs
+- subversion (svn)
+- cvs
+
+Note: CVS detection is disabled by default, because it can lead to considerable
+delay if the current repo is not a CVS one and the environment variable $CVSROOT
+is set nevertheless because a remote connection could be made.
+
+`quick jumping between changed lines`
+
+There are mappings for jumping forth and back between changed lines (so-called
+hunks). The following example shows the default mappings and how to change them:
+
+    let g:signify_mapping_next_hunk = '<leader>gn'
+    let g:signify_mapping_prev_hunk = '<leader>gp'
+
+Note: In case you don't know about the mapleader, have a look at `:h mapleader`.
+The default is the '\' button.
+
+`apart from signs there is also optional line highlighting`
+
+Sy shows you signs for changed lines. Moveover, you can enable highlighting of
+the concerned lines:
+
+    let g:signify_mapping_toggle_highlight = '<leader>gh'
+
+You can also change the highlighting classes for these lines. The defaults are:
+
+    let g:signify_line_color_add    = 'DiffAdd'
+    let g:signify_line_color_delete = 'DiffDelete'
+    let g:signify_line_color_change = 'DiffChange'
+
+`you can toggle the plugin per buffer`
+
+In case you want to disable the plugin for the current buffer, you can toggle
+it:
+
+    let g:signify_mapping_toggle = '<leader>gt'
+
+`exception lists for filetypes and filenames`
+
+If you want to disable Sy for certain kinds of filename or file types,
+you explicitely have to create exception lists:
+
+Example:
+
+    let g:signify_exceptions_filetype = [ 'vim', 'c' ]
+    let g:signify_exceptions_filename = [ '.vimrc' ]
+
+`good documentation`
+
+You should know by now!
+
 ## Installation
 
 I suggest using tpope's plain and awesome pathogen: