chore(ops): add PUBLISHING.md

PUBLISHING.md

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+# New version publishing instructions
+
+We're [cargo-smart-release](https://lib.rs/crates/cargo-smart-release) to automate the release process.
+
+## Writing commit messages
+
+As long as you adhere to the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) format, you can
+write your commit messages however you want.
+
+## Releasing workflow
+
+We're currently not releasing Python and WASM bindings, we're only releasing the Rust crate.
+
+In order to release a new version, simply run:
+
+```bash
+cargo smart-release --update-crates-index
+```
+
+Inspect the changes and confirm the release:
+
+```bash
+cargo smart-release --update-crates-index --execute
+```
+