Add FileType information to the README (#10)

* Add FileType information to the README
* Add ColorizerAttachToBuffer command

Author: filipekiss

README.md

@@ -80,6 +80,13 @@ require 'colorizer'.setup {
 
 For lower level interface, see the [LuaDocs for API details](https://norcalli.github.io/luadoc/nvim-colorizer.lua/modules/colorizer.html) or use `:h colorizer.lua` once installed.
 
+## Caveats
+
+If the file you are editing has no filetype, the plugin won't be attached, as it relies on AutoCmd to do so. You can still make it work by running the following command:
+`:ColorizerAttachToBuffer`
+
+See [this comment](https://github.com/norcalli/nvim-colorizer.lua/issues/9#issuecomment-543742619) for more information.
+
 ## TODO
 
 - [ ] Add more display modes?

plugin/colorizer.vim

@@ -3,5 +3,6 @@ if exists('g:loaded_colorizer')
 endif
 
 command! ReloadBufferColorizer lua require'colorizer'.reload_buffer()
+command! ColorizerAttachToBuffer lua require'colorizer'.attach_to_buffer(0)
 
 let g:loaded_colorizer = 1