Add location grouping with cola layout

config.go

@@ -0,0 +1,39 @@
+package tendrils
+
+import (
+	"encoding/json"
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	Locations map[string]*Location `yaml:"locations" json:"locations"`
+}
+
+type Location struct {
+	Nodes    []string             `yaml:"nodes,omitempty" json:"nodes,omitempty"`
+	Children map[string]*Location `yaml:"children,omitempty" json:"children,omitempty"`
+}
+
+func LoadConfig(path string) (*Config, error) {
+	if path == "" {
+		return &Config{}, nil
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	var cfg Config
+	if err := yaml.Unmarshal(data, &cfg); err != nil {
+		return nil, err
+	}
+
+	return &cfg, nil
+}
+
+func (c *Config) ToJSON() ([]byte, error) {
+	return json.Marshal(c)
+}