Add clang plugin

autoload/SpaceVim/layers/lang/c.vim

@@ -0,0 +1,21 @@
+" lang#c :
+"
+"      this layer provide c family language code completion.
+"
+"      requirement:
+"      clang
+"      libclang
+
+function! SpaceVim#layers#lang#c#plugins() abort
+    let plugins = []
+    if has('nvim')
+        call add(plugins, ['zchee/deoplete-clang'])
+    else
+        call add(plugins, ['Rip-Rip/clang_complete'])
+    endif
+    return plugins
+endfunction
+
+function! SpaceVim#layers#lang#c#config() abort
+    
+endfunction

config/plugins/deoplete-clang.vim

@@ -0,0 +1,4 @@
+let g:deoplete#sources#clang#libclang_path =
+            \ get(g:, 'deoplete#sources#clang#libclang_path', '/usr/lib/libclang.so')
+let g:deoplete#sources#clang#clang_header = 
+            \ get(g:, 'deoplete#sources#clang#clang_header', '/usr/lib/clang/')