add support for different recommendation levels: strict and standard

src/domain/RecommendationLevel.ts

@@ -0,0 +1,11 @@
+export enum RecommendationLevel {
+    Standard = 0,
+    Strict = 1,
+}
+
+export const RecommendationLevelNames = Object
+    .values(RecommendationLevel)
+    .filter((level) => typeof level === 'string') as string[];
+
+export const RecommendationLevels = RecommendationLevelNames
+    .map((level) => RecommendationLevel[level]) as RecommendationLevel[];