Created vim helpfile

- Based on README.md
- Added tags
- Created headings
- Added highlighting for commands
- Better formatting

Author: weierophinney

doc/gist-vim.txt

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+*Gist.vim* Vimscript for creating gists (http://gist.github.com)
+
+Usage                                          |gist-vim-usage| 
+Tips                                           |gist-vim-tips| 
+Requirements                                   |gist-vim-requirements| 
+License                                        |gist-vim-license| 
+Install                                        |gist-vim-install| 
+
+This is vimscript for creating gists (http://gist.github.com) 
+
+For the latest version please see https://github.com/mattn/gist-vim
+
+==============================================================================
+USAGE                                                         *gist-vim-usage* 
+
+:Gist~
+    Post current buffer to gist, using default privacy option.
+
+:'<,'>Gist~
+    Post selected text to gist, using defualt privacy option.
+    This applies to all permutations listed below (except multi).
+
+:Gist -p~
+    Create a private gist.
+
+:Gist -P~
+    Create a public gist.
+    (Only relevant if you've set gists to be private by default.)
+
+:Gist -P~
+    Post whole text to gist as public.
+    This is only relevant if you've set gists to be private by default;
+    if you get an empty gist list, try ":Gist --abandon".
+
+:Gist -P~
+    Post whole text to gist as public.
+    This is only relevant if you've set gists to be private by default.
+    If you get an empty gist list, try ":Gist --abandon".
+
+:Gist -a~
+    Create a gist anonymously.
+
+:Gist -m~
+    Create a gist with all open buffers.
+
+:Gist -e~
+    Edit the gist (you need to have opened the gist buffer first).
+    You can update the gist with the {:w} command within the gist buffer.
+
+:Gist -e foo.js~
+    Edit the gist with name "foo.js" (you need to have opened the gist buffer
+    first).
+
+:Gist -d~
+    Delete the gist (you need to have opened the gist buffer first).
+    Password authentication is needed.
+
+:Gist -f~
+    Fork the gist (you need to have opened the gist buffer first).
+    Password authentication is needed.
+ 
+:Gist XXXXX~
+    Get gist XXXXX.
+
+:Gist -c XXXXX~
+    Get gist XXXXX and add to clipboard.
+
+:Gist -l~
+    List your public gists.
+
+:Gist -l mattn~
+    List gists from user "mattn".
+
+:Gist -la~
+    List all (public and private) of your gists.
+
+==============================================================================
+TIPS                                                           |gist-vim-tips|
+
+If you set {g:gist_clip_command}, gist.vim will copy the gist code with option
+"-c".
+
+  - Mac: >
+    let g:gist_clip_command = 'pbcopy'
+<
+  - Linux: >
+    let g:gist_clip_command = 'xclip -selection clipboard'
+<
+  - Others (cygwin?): >
+    let g:gist_clip_command = 'putclip'
+<
+
+If you want to detect filetype from the filename: >
+
+    let g:gist_detect_filetype = 1
+<
+If you want to open the browser after the post: >
+
+    let g:gist_open_browser_after_post = 1
+<
+If you want to change the browser: >
+
+    let g:gist_browser_command = 'w3m %URL%'
+<
+or: >
+
+    let g:gist_browser_command = 'opera %URL% &'
+<
+On windows, this should work with your user settings.
+
+If you want to show your private gists with ":Gist -l": >
+
+    let g:gist_show_privates = 1
+<
+If you get problems when creating gists try: >
+
+	:Gist --abandon
+<
+
+==============================================================================
+REQUIREMENTS                                           |gist-vim-requirements|
+
+  - Curl command (http://curl.haxx.se/)
+  - and, if you want to use your git profile, the git command-line client.
+
+==============================================================================
+License                                                     |gist-vim-license|
+
+
+Copyright 2010 by Yasuhiro Matsumoto
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+OF THE POSSIBILITY OF SUCH DAMAGE.
+
+==============================================================================
+INSTALL                                                     |gist-vim-install|
+
+Copy gist.vim to your plugin directory.
+
+gist.vim will create a curl cookie-jar file in your runtimepath.
+
+rtp:
+  - plugin/gist.vim
+  - cookies/github
+
+If you want to uninstall gist.vim, remember to also remove "cookies/github".