Add a README

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+# rfc1751
+
+Convert between numbers and rfc1751 word-lists:
+
+    $ rfc1751 6582857583
+    NICE EASY TOOL
+
+    $ rfc1751 NICE EASY TOOL
+    6582857583
+
+Or as a library:
+
+    >>> import rfc1751
+
+    >>> rfc1751.decode('FROM CODE TOO'.split())
+    4523180557
+
+    >>> rfc1751.encode(4523180557)
+    ['FROM', 'CODE', 'TOO']