Add developer info on release management (#5)

* Add developer info on release management

* Fix typo

docs/make.jl

@@ -60,6 +60,9 @@ makedocs(
     # Explicitly specify documentation structure
     pages = [
         "Home" => "index.md",
+        "Advanced topics & developers" => [
+            "Release management" => "release-management.md",
+        ],
         "API reference" => "reference.md",
         "License" => "license.md"
     ],

docs/src/release-management.md

@@ -0,0 +1,42 @@
+# Release management
+
+To create a new release for Smesh.jl, perform the following steps:
+1) Make sure that all PRs and changes that you want to go into the release are merged to
+   `main` and that the latest commit on `main` has passed all CI tests.
+2) Determine the currently released version of Smesh.jl, e.g., on the
+   [release page](https://github.com/trixi-framework/Smesh.jl/releases). For this manual,
+   we will assume that the latest release was `v0.2.3`.
+3) Decide on the next version number. We follow [semantic versioning](https://semver.org/),
+   thus each version is of the form `vX.Y.Z` where `X` is the major version, `Y` the minor
+   version, and `Z` the patch version. In this manual, we assume that the major version is
+   always `0`, thus the decision process on the new version is as follows:
+   * If the new release contains *breaking changes* (i.e., user code might not work as
+     before without modifications), increase the *minor* version by one and set the
+     *patch* version to zero. In our example, the new version should thus be `v0.3.0`.
+   * If the new release only contains minor modifications and/or bug fixes, the *minor*
+     version is kept as-is and the *patch* version is increased by one. In our example, the
+     new version should thus be `v0.2.4`.
+4) Edit the `version` string in the
+   [`Project.toml`](https://github.com/trixi-framework/Smesh.jl/blob/main/Project.toml)
+   and set it to the new version. Push/merge this change to `main`.
+5) Go to GitHub and add a comment to the commit that you would like to become the new
+   release (typically this will be the commit where you just updated the version). You can
+   comment on a commit by going to the
+   [commit overview](https://github.com/trixi-framework/Smesh.jl/commits/main/) and clicking
+   on the title of the commit. The comment should contain the following text:
+   ```
+   @JuliaRegistrator register
+   ```
+6) Wait for the magic to happen! Specifically, JuliaRegistrator will create a new PR to the
+   Julia registry with the new release information. After a grace period of ~15 minutes,
+   this PR will be merged automatically. A short while after,
+   [TagBot](https://github.com/trixi-framework/Smesh.jl/blob/main/.github/workflows/TagBot.yml)
+   will create a new release of Smesh.jl in our GitHub repository.
+7) Once the new release has been created, the new version can be obtained through the Julia
+   package manager as usual.
+8) To make sure people do not mistake the latest state of `main` as the latest release, we
+   set the version in the `Project.toml` to a *development* version. The development version
+   should be the latest released version, with the patch version incremented by one, and the
+   `-dev` suffix added. For example, if you just released `v0.3.0`, the new development
+   version should be `v0.3.1-dev`. If you just released `v0.2.4`, the new development
+   version should be `v0.2.5-dev`.