Add about activity

V2rayNG/app/src/main/res/values-zh-rCN/strings.xml

@@ -170,6 +170,9 @@
     <string name="summary_pref_tg_group">加入Telegram Group</string>
     <string name="toast_tg_app_not_found">未找到Telegram app</string>
     <string name="title_privacy_policy">隐私权政策</string>
+    <string name="title_about">关于</string>
+    <string name="title_source_code">源代码</string>
+    <string name="title_tg_channel">Telegram 频道</string>
 
     <string name="title_pref_promotion">推广</string>
     <string name="summary_pref_promotion">一些推广,点击查看详情(捐赠可去除)</string>