Add project migration support and boilerplate

Implemented a new Migrator class in 'migrator.py' to automate the
transfer of projects from GitLab to Gitea, including handling project
visibility settings and descriptions. Also, created a '.gitignore' file
to exclude unnecessary files from the repository, such as Python
bytecode and virtual environments. Lastly, specified the required
libraries in 'requirements.txt' to run the migration script. This setup
eases the migration process for multiple projects and ensures a
consistent development environment by ignoring irrelevant files.

.gitignore

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+venv/
+*.pyc
+__pycache__/

migrator.py

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+import gitlab
+import gitea_py
+
+import configparser
+
+
+class Migrator:
+    def __init__(self, gitlab_url, gitlab_token, gitea_url, gitea_token):
+        self.gitlab = gitlab.Gitlab(gitlab_url, gitlab_token)
+
+        self.gitea = gitea_py.ApiClient()
+        self.gitea.configuration.host = gitea_url + '/api/v1'
+        self.gitea.configuration.api_key['access_token'] = gitea_token
+
+    def migrate(self, project_id):
+        project = self.gitlab.projects.get(project_id)
+        print(f'Migrating project {project.name}...')
+
+        api_instance = gitea_py.RepositoryApi(self.gitea)
+        body = gitea_py.MigrateRepoOptions(
+            clone_addr=project.http_url_to_repo,
+            auth_token=self.gitlab.private_token,
+            private=project.visibility == 'private',
+            repo_name=project.name,
+            description=project.description,
+        )
+
+        try:
+            api_instance.repo_migrate(body=body)
+            print(f'Project {project.name} migrated successfully!')
+        except Exception as e:
+            print(f'Failed to migrate project {project.name}: {e}')
+
+    def migrate_all(self):
+        projects = self.gitlab.projects.list(all=True)
+        for project in projects:
+            self.migrate(project.id)
+
+
+if __name__ == '__main__':
+    config = configparser.ConfigParser()
+    config.read('config.ini')
+
+    migrator = Migrator(
+        gitlab_url=config['gitlab']['url'],
+        gitlab_token=config['gitlab']['token'],
+        gitea_url=config['gitea']['url'],
+        gitea_token=config['gitea']['token']
+    )
+    migrator.migrate_all()

requirements.txt

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+git+https://codeberg.org/gitwithtea-py/gitwithtea_py
+python-gitlab