feat(about): invitation rule files

modules/about/client/templates/invitations-rules-en.md

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+## This is the `INVITATIONS RULES` of {{vm.appConfig.name}}
+
+The rules content is read from template file, it is support `markdown` style.
+
+If you want to change these rules, please modify the .md file at `modules/about/client/templates/invitations-rules-xx.md`.
+
+The `xx` is the language flag, like `zh`,`en` etc.

modules/about/client/templates/invitations-rules-zh.md

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+## 这是 `INVITATIONS RULES` 邀请函规则文档
+
+这些规则内容是从模板文件读取, 它完全支持 `markdown` 语法风格.
+
+如果你想修改规则内容, 请编辑 .md 文件, 它存放于 `modules/about/client/templates/invitations-rules-xx.md`.
+
+`xx` 代表语言标识符, 如 `zh`,`en` 等.

modules/about/client/views/invitationsRules.client.view.html

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+<section ng-controller="AboutController as vm">
+    <div marked src="'/modules/about/client/templates/invitations-rules-'+vm.lang+'.md'" compile="true">
+    </div>
+</section>