Adds get all promos endpt

src/main/java/com/nisum/ascend/promotions/controller/PromotionsController.java

@@ -20,9 +20,9 @@ public class PromotionsController {
     PromotionService promotionService;
 
     @GetMapping()
-    public Flux<ResponseEntity<PromotionDto>> getAllPromotions(@RequestParam(required = false) String itemSku){
-        //TODO: get all promos OR promos by item SKU
-        return null;
+    public ResponseEntity<Flux<PromotionDto>> getAllPromotions(@RequestParam(required = false) String itemSku){
+        //TODO: test once we have real data
+        return ResponseEntity.ok(promotionService.findAll());
     }
 
     @GetMapping("/{id}")

src/main/java/com/nisum/ascend/promotions/service/PromotionService.java

 package com.nisum.ascend.promotions.service;
 
+import com.nisum.ascend.promotions.dto.PromotionDto;
 import com.nisum.ascend.promotions.repository.PromotionRepository;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
+import reactor.core.publisher.Flux;
 
 @Service
 public class PromotionService {
 
     @Autowired
     PromotionRepository promotionRepository;
+
+    public Flux<PromotionDto> findAll(){
+        return promotionRepository.findAll().map(PromotionDto::generateDtoFromPromotion);
+    }
 }