add config

config/encoder/hcl/hcl.go

@@ -0,0 +1,26 @@
+package hcl
+
+import (
+	"encoding/json"
+
+	"github.com/hashicorp/hcl"
+	"github.com/micro/go-micro/config/encoder"
+)
+
+type hclEncoder struct{}
+
+func (h hclEncoder) Encode(v interface{}) ([]byte, error) {
+	return json.Marshal(v)
+}
+
+func (h hclEncoder) Decode(d []byte, v interface{}) error {
+	return hcl.Unmarshal(d, v)
+}
+
+func (h hclEncoder) String() string {
+	return "hcl"
+}
+
+func NewEncoder() encoder.Encoder {
+	return hclEncoder{}
+}