feat: Add GitRepoRegistration cmdlets (#5)

- adds GitRepoRegistration cmdlets
- adds basic tests for GitRepoRegistration implementations
- adds initial build project and scripts

Refs: #5, #6

tests/ModuleTests/Git/TestData/AddRegistrationTestData.cs

@@ -0,0 +1,18 @@
+using System.Linq;
+
+namespace ModuleTests.Git.TestData;
+
+public class AddRegistrationTestData : TestDataEnumerator<(int testId, string path)>
+{
+	public AddRegistrationTestData()
+	{
+		Data = new List<string>()
+			{
+				"test",
+				$"test{Path.DirectorySeparatorChar}path",
+				$"other{Path.AltDirectorySeparatorChar}path"
+			}
+			.Select((x, i) => (i, x))
+			.ToList();
+	}
+}