Add indentation disabling documentation

Author: alx741

README.md

@@ -64,6 +64,14 @@ Disabling Template Haskell and Quasiquoting syntax is possible by setting
 
 To configure indentation in `haskell-vim` you can use the following variables to change indentation depth, just add the according line to your `.vimrc`.
 
+Given the current problems with indentation (being solved in the *indentation*
+branch) you can disable the indentation by setting `g:haskell_indent_disable` to
+`1`.
+
+Additionally you can use the
+[vim-hindent](https://github.com/alx741/vim-hindent) plugin to achieve automatic
+indentation using *hindent*.
+
 #### Haskell
 
 * `let g:haskell_indent_if = 3`

doc/haskell-vim.txt

@@ -76,6 +76,8 @@ INDENTATION                                             *haskell-vim-indentation
 To configure indentation in `haskell-vim` you can use the following variables to
 change indentation depth, just add the according line to your `.vimrc`.
 
+You can disable the indentation by setting `g:haskell_indent_disable` to `1`.
+
 Haskell~
 
   * |haskell-vim-indent-if|