Adds version command and Makefile for build info

Provides a `gitlocal version` command to display the application's version, commit hash, and build date.

Introduces a `Makefile` to automate builds, installations, and tests. The Makefile dynamically extracts version, commit, and date from git tags, commit hashes, and build timestamps, injecting this metadata into the Go binary via `ldflags`.

Updates the `README.md` to document the new command and recommended build process using the Makefile.

Makefile

@@ -0,0 +1,43 @@
+.PHONY: build install test clean version
+
+# Get version from git tag, fallback to dev
+VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+COMMIT ?= $(shell git rev-parse --short HEAD 2>/dev/null || echo "unknown")
+DATE ?= $(shell date -u +"%Y-%m-%dT%H:%M:%SZ")
+
+# Ldflags to inject version information
+LDFLAGS := -ldflags "-X git.membo.co.uk/dtomlinson/gitlocal/cmd.Version=$(VERSION) \
+                      -X git.membo.co.uk/dtomlinson/gitlocal/cmd.Commit=$(COMMIT) \
+                      -X git.membo.co.uk/dtomlinson/gitlocal/cmd.Date=$(DATE)"
+
+# Build the binary
+build:
+	@echo "Building gitlocal $(VERSION)..."
+	go build $(LDFLAGS) -o gitlocal .
+
+# Install to $GOPATH/bin
+install:
+	@echo "Installing gitlocal $(VERSION)..."
+	go install $(LDFLAGS) .
+
+# Run tests
+test:
+	@echo "Running tests..."
+	go test -v ./...
+
+# Run tests with coverage
+coverage:
+	@echo "Running tests with coverage..."
+	go test -coverprofile=coverage.out ./...
+	go tool cover -func=coverage.out
+
+# Clean build artifacts
+clean:
+	@echo "Cleaning..."
+	rm -f gitlocal coverage.out
+
+# Show version that would be built
+version:
+	@echo "Version: $(VERSION)"
+	@echo "Commit:  $(COMMIT)"
+	@echo "Date:    $(DATE)"

README.md

@@ -74,6 +74,19 @@ Converted Repositories (2):
     Branch: master
 ```
 
+### Show version information
+
+```bash
+gitlocal version
+```
+
+Example output:
+```
+gitlocal version v0.1.0
+  Commit: a1b2c3d
+  Built:  2026-04-11T14:30:00Z
+```
+
 ## Using git with .gitlocal
 
 Add this alias to your `.zshrc` or `.bashrc`:
@@ -121,11 +134,27 @@ cd gitlocal
 # Install dependencies
 go mod download
 
-# Build the binary
+# Build with version info (recommended - uses Makefile)
+make build
+
+# Or install to $GOPATH/bin with version info
+make install
+
+# Build without version info (not recommended)
 go build -o gitlocal
 
-# Or install directly to $GOPATH/bin
-go install
+# Check version that would be built
+make version
+```
+
+The Makefile automatically injects version information from git tags:
+- `Version`: Git tag (e.g., `v0.1.0`) or commit hash if no tag exists
+- `Commit`: Short commit hash
+- `Date`: Build timestamp
+
+Check the version after installing:
+```bash
+gitlocal version
 ```
 
 ### Running Tests

cmd/version.go

@@ -0,0 +1,31 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	// Version is set via -ldflags during build
+	Version = "dev"
+	// Commit is set via -ldflags during build
+	Commit = "unknown"
+	// Date is set via -ldflags during build
+	Date = "unknown"
+)
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Print version information",
+	Long:  `Display the version, commit hash, and build date of gitlocal.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("gitlocal version %s\n", Version)
+		fmt.Printf("  Commit: %s\n", Commit)
+		fmt.Printf("  Built:  %s\n", Date)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}