Merge branch 'feature/add-format-validator' into 'master'

feat: 添加格式验证程序

See merge request codechina/mirrors-settings!201

validator.rb

+require 'yaml'
+
+# run `ruby validator.rb` in current directory
+
+Dir.children('projects').each do |folder|
+  begin
+    path = "projects/#{folder}/imports.yml"
+    YAML.load(File.read(path)) if File.exists?(path)
+  rescue => exception
+    puts "#{exception}"
+    puts "Format wrong with projects/#{folder}/imports.yml"
+  end
+end
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