Update readme with setup instructions in init.vim.

Author: kristijanhusak

README.md

@@ -64,12 +64,24 @@ call dein#add('kristijanhusak/orgmode.nvim')
 ## Setup
 
 ```lua
+-- init.lua
 require('orgmode').setup({
   org_agenda_files = {'~/Dropbox/org/*', '~/my-orgs/**/*'},
   org_default_notes_file = '~/Dropbox/org/refile.org',
 })
 ```
 
+Or if you are using `init.vim`:
+```vim
+" init.vim
+lua << EOF
+require('orgmode').setup({
+  org_agenda_files = {'~/Dropbox/org/*', '~/my-orgs/**/*'},
+  org_default_notes_file = '~/Dropbox/org/refile.org',
+})
+EOF
+```
+
 * **Open agenda prompt**: <kbd>\<Leader\>oa</kbd>
 * **Open capture prompt**: <kbd>\<Leader\>oc</kbd>
 * In any orgmode buffer press <kbd>?</kbd> for help