Added docs for iconv

pages/common/iconv.md

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+# iconv
+
+> Converts text from one encoding to another
+
+- convert file and print to stdout
+
+`iconv -f {{from_encoding}} -t {{to_encoding}} {{input_file}}`
+
+- convert file to current locale
+
+`iconv -f {{from_encoding}} {{input_file}} > {{output_file}}`
+
+- list supported encodings
+
+`iconv -l`