Add "Branch workflow"

006-git.md

@@ -0,0 +1,24 @@
+# 006 - Git
+
+## Branch workflow
+
+- Create a dedicated branch for each feature. Develop each version in specific branches.
+- Before the first release, main branch is `master`.
+- After the first release, rename `master` to `1.x`. For a major release, create a new version branch such as `2.x`. The main branch is the branch with the current stable release.
+
+## Commit messages
+
+### Subject line
+
+- Use `#123` to reference issue by number
+- Use imperative mood that's `Fix`, not `Fixed`
+- Don't add period at the end
+- Use `[skip ci]` if there is no need to run unit tests
+- Start with a capital letter
+- Limit to 50 characters
+
+### Body
+
+Use message body **if** you need an extra explanation. Explain why, not how.
+
+- Limit line length to 72 characters

README.md

@@ -14,7 +14,7 @@
 - [003 - Roadmap](003-roadmap.md)
 - [004 - Namespaces](004-namespaces.md)
 - [005 - Development tool](005-development-tool.md)
-- [006 - Git commit messages](006-git-commit-messages.md)
+- [006 - Git](006-git.md)
 - [007 - Exceptions](007-exceptions.md)
 - [008 - Interfaces](008-interfaces.md)
 - [009 - Design decisions](009-design-decisions.md)