feat(repository): add ability to clone repository

test/repository_clone_test.dart

@@ -0,0 +1,68 @@
+import 'dart:io';
+import 'package:test/test.dart';
+import 'package:libgit2dart/libgit2dart.dart';
+import 'helpers/util.dart';
+
+void main() {
+  late Repository repo;
+  late Directory tmpDir;
+  final cloneDir = Directory('${Directory.systemTemp.path}/cloned');
+
+  setUp(() async {
+    tmpDir = await setupRepo(Directory('test/assets/testrepo/'));
+    repo = Repository.open(tmpDir.path);
+
+    if (await cloneDir.exists()) {
+      cloneDir.delete(recursive: true);
+    }
+  });
+
+  tearDown(() async {
+    repo.free();
+    await tmpDir.delete(recursive: true);
+    cloneDir.delete(recursive: true);
+  });
+
+  group('Repository.clone', () {
+    test('successfully clones repository', () async {
+      final clonedRepo = Repository.clone(
+        url: tmpDir.path,
+        localPath: cloneDir.path,
+      );
+
+      expect(clonedRepo.isEmpty, false);
+      expect(clonedRepo.isBare, false);
+
+      clonedRepo.free();
+    });
+
+    test('successfully clones repository as bare', () async {
+      final clonedRepo = Repository.clone(
+        url: tmpDir.path,
+        localPath: cloneDir.path,
+        bare: true,
+      );
+
+      expect(clonedRepo.isEmpty, false);
+      expect(clonedRepo.isBare, true);
+
+      clonedRepo.free();
+    });
+
+    test('successfully clones repository with provided checkout branch name',
+        () async {
+      final clonedRepo = Repository.clone(
+        url: tmpDir.path,
+        localPath: cloneDir.path,
+        bare: true,
+        checkoutBranch: 'feature',
+      );
+
+      expect(clonedRepo.isEmpty, false);
+      expect(clonedRepo.isBare, true);
+      expect(clonedRepo.head.name, 'refs/heads/feature');
+
+      clonedRepo.free();
+    });
+  });
+}