chore: add readme for cutting release (#10070)

Co-authored-by: Luca Casonato <lucacasonato@yahoo.com>
Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>

tools/cut_a_release.md

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+# Cutting a Deno release
+
+**During this process `main` branch (or any other branch that you're creating
+release from) should be frozen and no commits should land until the release is
+cut.**
+
+1. Create a PR that bumps versions of all crates in `op_crates` and `runtime`
+   directories.
+
+To determine if you should bump a crate a minor version instead of a patch
+version, check if you can answer any of the following questions with yes:
+
+- Did any of the crates direct dependencies have a semver breaking change? For
+  example did we update swc_ecmascript from 0.56.0 to 0.57.0, or did we update
+  rusty_v8?
+- Did the external interface of the crate change (ops or changes to
+  `window.__bootstrap` in JS code)?
+
+When in doubt always do a minor bump instead of a patch. In essentially every
+release all crates will need a minor bump. Patch bumps are the exception, not
+the norm.
+
+2. Make sure CI pipeline passes.
+
+3. Publish all bumped crates to `crates.io`
+
+**Make sure that `cargo` is logged on with a user that has permissions to
+publish those crates.**
+
+This is done by running `cargo publish` in each crate, because of dependencies
+between the crates, it must be done in specific order:
+
+- `deno_core` - all crates depend on `deno_core` so it must always be published
+  first
+- crates in `op_crates/` directory - there is no specific order required for
+  those
+- `runtime` - this crate depends on `deno_core` and all crates in `op_crates/`
+  directory
+
+If there are any problems when you publish, that require you to change the code,
+then after applying the fixes they should be commited and pushed to the PR.
+
+4. Once all crates are published merge the PR.
+
+5. Create a PR that bumps `cli` crate version and updates `Releases.md`.
+
+6. Make sure CI pipeline passes.
+
+7. Publish `cli` crate to `crates.io`
+
+8. Merge the PR.
+
+9. Create a tag with the version number (with `v` prefix).
+
+10. Wait for CI pipeline on the created tag branch to pass.
+
+The CI pipeline will create a release draft on GitHub
+(https://github.com/denoland/deno/releases).
+
+11. Upload Apple M1 build to the release draft & to dl.deno.land.
+
+12. Publish the release on Github
+
+13. Update the Deno version on the website by updating
+    https://github.com/denoland/deno_website2/blob/main/versions.json.