Export ws port 9944 and add doc
Fix
@@ -27,7 +27,7 @@ RUN curl https://sh.rustup.rs -sSf | sh -s -- -y && \
COPY version /polkadot
WORKDIR /polkadot
-EXPOSE 30333 9933
+EXPOSE 30333 9933 9944
VOLUME ["/data"]
CMD ["/bin/sh", "polkadot"]
