eselect-news: add page (tldr-pages#13925)

pages/linux/eselect-news.md

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+# eselect news
+
+> An `eselect` module for reading Gentoo news items.
+> Note: Portage will print a notice when a repository is synchronized and there are unread news items.
+> More information: <https://wiki.gentoo.org/wiki/Eselect#News>.
+
+- List available news items with their numbers (all by default):
+
+`eselect news list {{all|new}}`
+
+- Print the specified news items:
+
+`eselect news read {{number1 number2 ...}}`
+
+- Print all unread news items:
+
+`eselect news read`
+
+- Mark the specified news items as unread:
+
+`eselect news unread {{number1 number2 ...}}`
+
+- Delete all read news items:
+
+`eselect news purge`
+
+- Print the number of available news items (new by default):
+
+`eselect news count {{all|new}}`