add readme

README.md

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+libUnreadMail
+=============
+
+This library implements barely enough IMAP to read unseen mail. It also
+contains an example program, that fetches said mails and prints them to stdout.
+
+You can use either Fetch(*Parameters) or FetchPlaintext(*Parameters) provided
+in libUnreadMail.go as your entry points. The former fetches the whole message
+as golangs net/mail, the latter fetches the plain-text parts as strings.
+
+unreadMail
+==========
+
+* go get the libUnreadMail repo
+* enter the unreadMail subfolder
+* go install
+* use $GOPATH/bin/unreadMail -cert $cert -server foobar.com -user spam -passwd eggs  to fetch mail
+* the fetched mail will be marked as read