feat: add workflows/02-git-flow

Author: Aymin Jafari

git-flow.md

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+# Git Flow
+
+Git Flow is a branching model for managing releases.
+
+## Branches
+- `main`: Stable production code.
+- `develop`: Integration branch for features.
+- `feature/`: Branches for new features.
+- `release/`: Branches for preparing releases.
+- `hotfix/`: Branches for urgent fixes.
+
+## Usage
+- Use `git flow init` to initialize Git Flow.
+- Follow the Git Flow commands for feature, release, and hotfix branches.
+
+## Example
+```bash
+git flow feature start login
+```