Add example

README.md

@@ -19,6 +19,54 @@ implementation quite closely.
 [renovate]: https://github.com/renovatebot/renovate/blob/main/lib/versioning/docker/readme.md
 [renovate implementation]: https://github.com/renovatebot/renovate/tree/main/lib/datasource/docker
 
+## Example
+
+```golang
+package main
+
+import (
+	"fmt"
+	"sort"
+
+	"coopcloud.tech/tagcmp"
+)
+
+func main() {
+	rawTags := []string{
+		"1.7.1",
+		"1.9.4-linux-arm64",
+		"1.14.0-rootless",
+		"linux-arm64-rootless",
+		"1.14.1-rootless",
+		"1.12.4-linux-amd64",
+		"1.14.2-rootless",
+	}
+
+	tag, err := tagcmp.Parse("1.14.0-rootless")
+	if err != nil {
+		panic(err)
+	}
+
+	var compatible []tagcmp.Tag
+	for _, rawTag := range rawTags {
+		parsed, _ := tagcmp.Parse(rawTag) // skipped unsupported tags
+		if tag.IsCompatible(parsed) {
+			compatible = append(compatible, parsed)
+		}
+	}
+
+	sort.Sort(tagcmp.ByTag(compatible))
+
+	fmt.Println(compatible)
+}
+```
+
+Output:
+
+```golang
+[1.14.0-rootless 1.14.1-rootless 1.14.2-rootless]
+```
+
 ## Documentation
 
 [godoc.md](./godoc.md)