nvim: add nvim configs

dot_config/nvim/lua/utils/zenkaku.lua

@@ -0,0 +1,15 @@
+-- ZenkakuSpace
+vim.cmd([[
+function! ZenkakuSpace()
+    highlight ZenkakuSpace cterm=underline guibg=lightred
+endfunction
+
+if has('syntax')
+    augroup ZenkakuSpace
+        autocmd!
+        autocmd ColorScheme * call ZenkakuSpace()
+        autocmd VimEnter,WinEnter,BufRead * let w:m1=matchadd('ZenkakuSpace', '　')
+    augroup END
+    call ZenkakuSpace()
+endif
+]])