Added "create list" handler, service + repository

internal/api/request/list.go

@@ -0,0 +1,27 @@
+package request
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type CreateListPayload struct {
+	Name    string   `json:"name"`
+	UserIDs []string `json:"user_ids"`
+}
+
+func DecodeCreateList(r *http.Request) (CreateListPayload, error) {
+	var payload CreateListPayload
+
+	r.Body = http.MaxBytesReader(nil, r.Body, 1024*64)
+
+	decoder := json.NewDecoder(r.Body)
+	decoder.DisallowUnknownFields()
+
+	if err := decoder.Decode(&payload); err != nil {
+		return payload, fmt.Errorf("error decoding create list payload: %w", err)
+	}
+
+	return payload, nil
+}