chore: ignore any nested .DS_Store file

PR-URL: #1057
Credit: @ruyadorno
Close: #1057
Reviewed-by: @ruyadorno

Author: ruyadorno

.gitignore

@@ -24,4 +24,5 @@ npm-debug.log
 .nyc_output
 /test/npm_cache*
 /node_modules/.cache
-.DS_Store
+.DS_Store
+**/.DS_Store