Add a short tldr page for emacs client

pages/common/emacsclient.md

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+# emacsclient
+
+> Open files in an existing emacs server.
+
+- Open file in console mode (without X window):
+
+`emacsclient -nw {{filename}}`
+
+- Open a file and not wait for it:
+
+`emacsclient -n {{filename}}`