feat: initial commit of Git Automation CLI

- Add comprehensive Git workflow automation tools
- Include branch management utilities
- Add commit helpers with conventional commit support
- Implement GitHub integration for PR management
- Add configuration management system
- Include comprehensive test coverage
- Add professional documentation and examples

internal/version/version.go

@@ -0,0 +1,22 @@
+package version
+
+var (
+	// Version is the current version of the application
+	Version = "0.1.0"
+	// GitCommit is the git commit hash
+	GitCommit = ""
+	// BuildDate is the date when the binary was built
+	BuildDate = ""
+)
+
+// GetVersion returns the complete version information
+func GetVersion() string {
+	version := Version
+	if GitCommit != "" {
+		version += " (" + GitCommit + ")"
+	}
+	if BuildDate != "" {
+		version += " built on " + BuildDate
+	}
+	return version
+}