[nvim] Add fzf spellsuggest

Added fzf as selector interface for spell correction
selecting. Can be invoked through command
`FzfSpellSuggest` for now. Can be bound to keymapping if needed more
often; or if intending to overwrite default spell correction.

nvim/.config/nvim/plugin/personal/spellsuggest.vim

@@ -0,0 +1,13 @@
+function! s:fzfSpellSink(word)
+  exe 'normal! "_ciw'.a:word
+endfunction
+function! FzfSpell()
+  let l:spellstatus = &spell
+  setlocal spell
+  let suggestions = spellsuggest(expand("<cword>"))
+  if l:spellstatus
+  return fzf#run({'source': suggestions, 'sink': function("s:fzfSpellSink"), 'right': "20%" })
+
+endfunction
+
+command FzfSpellSuggest :call FzfSpell()<CR>