add README.md

Author: enerick

README.md

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+exported from code.google.com/p/erl8583
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+# Erl8583
+An Erlang ISO 8583 library
+
+Erl8583 provides Erlang modules and functions for packing and unpacking ISO 8583 messages in several formats: ASCII, binary, XML, JSON and EBCDIC. A generic marshalling module is provided for implementing other encoding schemes.
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+The library has been tested with packing schemes used by jPOS, Postilion, iso8583py and American Express.
+
+The user guide (available as a PDF on the ["Downloads"](https://code.google.com/archive/p/erl8583/downloads) page) is a good place to start. The user guide gives an introduction to ISO 8583, describes Erl8583 and its installation and dependencies and includes 8 examples.