nano: started tldr for nano

pages/common/nano.md

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+# nano
+
+> Simple, easy to use editor. An enhanced, free Pico clone.
+
+- Start nano in terminal with {filename}
+
+`nano {filename}`
+
+- Save and then exit nano
+
+`ctrl-x`
+
+- Save file without exitting
+
+`ctrl-o`