新增删除rss阅读记录功能 (#4451)

* 新增删除rss阅读记录功能

* 优化

app/src/main/res/values/strings.xml

@@ -774,6 +774,7 @@
     <string name="donate_summary">Your donation makes this app better</string>
     <string name="about_summary">Wechat official account [开源阅读软件]</string>
     <string name="read_record">Read record</string>
+    <string name="del_read_record">Delete Read record</string>
     <string name="read_record_summary">Read record summary</string>
     <string name="local_tts">Local TTS</string>
     <string name="thread_count">Thread count</string>