Write up the release process (projectfluent#284)

Author: gregtatum

docs/release-process.md

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+# Release Process
+
+`fluent-rs` doesn't use strict semver yet, until the 1.0.0 release. Instead major changes are released as minor releases.
+
+## 1. Bump version numbers
+
+To update a package, use the `cargo-release` tool. It can be installed with `cargo install cargo-release`.
+
+For instance to bump the `fluent-fallback` version run:
+
+```sh
+cargo release version minor -p fluent-fallback --execute
+```
+
+This will output:
+
+```
+Upgrading fluent-fallback from 0.6.0 to 0.7.0
+ Updating fluent-resmgr's dependency from 0.6.0 to 0.7.0
+ Updating fluent-testing's dependency from 0.6.0 to 0.7.0
+```
+
+After this the depending packages must be updated as well:
+
+```sh
+cargo release version patch -p fluent-resmgr -p fluent-testing --execute
+```
+
+## 2. Update the changelog
+
+These are located here:
+
+```
+./fluent/CHANGELOG.md
+./fluent-bundle/CHANGELOG.md
+./fluent-fallback/CHANGELOG.md
+./fluent-pseudo/CHANGELOG.md
+./fluent-resmgr/CHANGELOG.md
+./fluent-syntax/CHANGELOG.md
+./fluent-testing/CHANGELOG.md
+./intl-memoizer/CHANGELOG.md
+```
+
+## 3. Send in a PR for review
+
+Get a quick sign off and merge from one other of the project maintainers and ensure the automated tests are succeeding.
+
+## 4. Tag the release.
+
+Go to the [create a new release](https://github.com/projectfluent/fluent-rs/releases/new) section.
+
+The tag should be formatted like so:
+
+`fluent-fallback@0.7.0`
+
+Add the title, and add the changelog to the description. Before 1.0.0 release, mark as pre-release.
+
+## 5. Publish the crates
+
+If you do not have publish access for the crates, request access from one of the owners.
+
+Do a dry run of the publish steps for each module.
+
+```
+cargo publish -p fluent-fallback --dry-run
+cargo publish -p fluent-resmgr --dry-run
+cargo publish -p fluent-testing --dry-run
+```
+
+Perform the actual publish:
+
+```
+cargo publish -p fluent-fallback
+cargo publish -p fluent-resmgr
+cargo publish -p fluent-testing
+```
+
+## 6. (Mozilla-only) Vendoring the crates into `mozilla-central`
+
+a. [Search for all references](https://searchfox.org/mozilla-central/search?q=%5Efluent-%5Cw%2B+%3D+%22.*%22&path=&case=false&regexp=true) to the updated package.
+a. Bump the numbers.
+a. Run `mach cargo vet` to go through the vetting process and certify the results.
+a. Commit `supply-chain/audits.toml`
+a. Run `mach vendor rust`
+a. Ensure it builds and tests pass then send it in for review.