Add README.

README.md

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+# j7s zenoh bridge
+
+Bridge ROS2 together using Zenoh in between.
+
+
+## Additional Deps
+
+```
+RUN curl -L https://download.eclipse.org/zenoh/debian-repo/zenoh-public-key | sudo gpg --dearmor --yes --output /etc/apt/keyrings/zenoh-public-key.gpg && \
+    echo "deb [signed-by=/etc/apt/keyrings/zenoh-public-key.gpg] https://download.eclipse.org/zenoh/debian-repo/ /" | sudo tee -a /etc/apt/sources.list > /dev/null && \
+    sudo apt update && \
+    sudo apt install -y libzenohcpp-dev libzenohc-dev
+``