Added coc-settings.json for windows

coc-settings_win.json

@@ -0,0 +1,9 @@
+{
+  "languageserver": {
+    "clangd": {
+      "command": "clangd",
+      "filetypes": ["c", "cpp"],
+      "rootPatterns": ["compile_flags.txt", "compile_commands.json", ".vim/", ".git/", ".hg/"]
+    }
+  }
+}