Added initial README

This is a simple readme which should give people at
least a starting point for installation and configuration.

README.md

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+Neosnippet
+==========
+
+# Description
+
+Neosnippet add snippet support to vim, using the [Neocomplecache](https://github.com/Shougo/neocomplcache) framework.
+
+What is a snippet? It's a template for commonly used code that you can fill in on the fly.
+
+# Installation
+
+1. Install [Neocomplecache](https://github.com/Shougo/neocomplcache) first.
+2. Put files in your Vim directory (usually `~/.vim/` or
+   `%PROGRAMFILES%/Vim/vimfiles` on Windows).
+
+# Configuration
+
+Here is an example `~/.vimrc` configuration for Neosnippet.  It is assumed
+you already have Neocomplecache configured.
+
+With these settings, you will use the following keys:
+
+* `C-k` to select-and-expand a snippet from the Neocomplecache popup (Use `C-n`
+  and `C-p` to select it). `C-k` can also be used to jump to the next field in
+  the snippet.
+* `Tab` to select the next field to fill in the snippet.
+
+```vim
+" Plugin key-mappings.
+imap <C-k>     <Plug>(neosnippet_expand_or_jump)
+smap <C-k>     <Plug>(neosnippet_expand_or_jump)
+
+" SuperTab like snippets behavior.
+imap <expr><TAB> neosnippet#expandable() ? "\<Plug>(neosnippet_expand_or_jump)" : pumvisible() ? "\<C-n>" : "\<TAB>"
+smap <expr><TAB> neosnippet#expandable() ? "\<Plug>(neosnippet_expand_or_jump)" : "\<TAB>"
+
+" For snippet_complete marker.
+if has('conceal')
+  set conceallevel=2 concealcursor=i
+endif
+
+```
+
+If you want to use a different collection of snippets other than the built-in
+ones, such as [Honza's Snippets](https://github.com/honza/snipmate-snippets), then you
+can set the `g:neosnippet#snippets_directory` variable.
+
+```vim
+" Tell Neosnippet about these snippets
+let g:neosnippet#snippets_directory='~/.vim/bundle/snipmate-snippets/snippets'
+```
+