feat: unifood base with GET dishes (#1)

Features:
- CLI structure with verbs and resources
- Application config and parameters
- Output formatters
- Initial resource: dishes

Reviewed-on: #1
Co-authored-by: bdoerfchen <git@bissendorf.co>
Co-committed-by: bdoerfchen <git@bissendorf.co>

core/output/yaml.go

@@ -0,0 +1,20 @@
+package output
+
+import (
+	"bytes"
+	"io"
+
+	"git.bissendorf.co/bissendorf/unifood/m/v2/core/interfaces"
+	"github.com/goccy/go-yaml"
+)
+
+type YamlFormatter struct{}
+
+func (f *YamlFormatter) Format(list *interfaces.ResourceList) (io.Reader, error) {
+	buffer, err := yaml.Marshal(list)
+	if err != nil {
+		return nil, err
+	}
+
+	return bytes.NewBuffer(buffer), nil
+}