Add release guide (#130)

Add steps related to publishing the crate

Author: abrown

RELEASING.md

@@ -0,0 +1,41 @@
+# Release Process
+
+To publish a new version of these crates:
+
+1. Bump the crate versions using semantic versioning. As described in Cargo's [semver compatibility]
+   documentation and because this crate is not yet released as "1.0", we typically release major
+   breaking changes as a _minor_ semver bump and anything less than that as a _patch_ semver bump.
+   After bumping, open a [PR]:
+
+   ```shell script
+   git checkout -b bump-version
+   cargo xtask bump patch --git
+   git push -u <FORK>
+   # open PR
+   ```
+
+[semver compatibility]: https://doc.rust-lang.org/cargo/reference/semver.html#change-categories
+[PR]: https://github.com/intel/openvino-rs/pulls
+
+2. Once the bump PR is merged, publish the crates:
+
+   ```shell script
+   git checkout main
+   git pull
+   cargo xtask publish --git
+   ```
+
+   You may want to check that everything looks right on [crates.io] after this step. Note that the
+   `--git` flag is equivalent to `git tag v<VERSION>; git push origin v<VERSION>`. If your remotes
+   won't work with this default `origin` for any reason, those commands can be run manually.
+
+[crates.io]: https://crates.io/crates/openvino
+
+3. Once published, [draft a new release] on GitHub. Use the newly-published tag and use "Generate
+   release notes" for a sane changelog description.
+
+[draft a new release]: https://github.com/intel/openvino-rs/releases/new
+
+4. Eventually, check that [docs.rs] was able to build the crate documentation correctly.
+
+[docs.rs]: https://docs.rs/openvino