add chinese for pages.cn/linux/add-apt-respository.md

pages.cn/common/ncmpcpp.md

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+# ncmpcpp
+
+> A command line music player client for the Music Player Daemon.
+
+- Connect to a music player daemon on a given host and port:
+
+`ncmpcpp --host {{ip}} --port {{port}}`
+
+- Display metadata of the current song to console:
+
+`ncmpcpp --current-song`
+
+- Use a specified configuration file:
+
+`ncmpcpp --config {{file}}`
+
+- Use a different set of key bindings from a file:
+
+`ncmpcpp --bindings {{file}}`