docs(git): add initial Git configuration recipe

recipes/git/01_configure-user.md

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+# Configure Git User
+
+This recipe configures the Git author identity used when creating commits.
+
+## Verify Current Configuration
+
+```bash
+git config --global --get user.name
+git config --global --get user.email
+```
+
+## Configure Global Identity
+
+Replace the values below with your own information.
+
+```bash
+git config --global user.name "Jota Odiceu"
+git config --global user.email "jotaodiceu@odinetwork.com.br"
+```
+
+## Verify Configuration
+
+```bash
+git config --global --list | grep user
+```
+
+Expected output:
+
+```text
+user.name=Jota Odiceu
+user.email=jotaodiceu@odinetwork.com.br
+```
+
+## Repository Specific Configuration
+
+Override the global identity for a single repository.
+
+```bash
+git config user.name "Another Name"
+git config user.email "another@email.com"
+```
+
+## Troubleshooting
+
+### Git still uses another email
+
+Check where the value comes from.
+
+```bash
+git config --show-origin --get user.email
+```
+
+If the repository has a local configuration, it overrides the global one.
+
+### Verify all configuration
+
+```bash
+git config --list --show-origin
+```