Update README.md

Add link to standard.
Railway-CCS · Nov 8, 2023 · 9891618 · 9891618
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 C library implementation of the Rail Safe Transport Application (RaSTA) protocol.
 
+## Specification
+
+RaSTA is specified in DIN VDE V 0831-200.
+The standard is available to purchase here https://www.vde-verlag.de/normen/0800234/din-vde-v-0831-200-vde-v-0831-200-2015-06.html.
+
 ## Deployment
 ### Unit tests
 see [CUnit HowTo](md_doc/cunit.md)