Add risk score

Signed-off-by: Tushar Goel <tushar.goel.dav@gmail.com>

Author: TG1999

vulnerabilities/api_v2.py

@@ -161,6 +161,7 @@ def list(self, request, *args, **kwargs):
 
 class PackageV2Serializer(serializers.ModelSerializer):
     purl = serializers.CharField(source="package_url")
+    risk_score = serializers.FloatField(read_only=True)
     affected_by_vulnerabilities = serializers.SerializerMethodField()
     fixing_vulnerabilities = serializers.SerializerMethodField()
     next_non_vulnerable_version = serializers.CharField(read_only=True)
@@ -174,6 +175,7 @@ class Meta:
             "fixing_vulnerabilities",
             "next_non_vulnerable_version",
             "latest_non_vulnerable_version",
+            "risk_score",
         ]
 
     def get_affected_by_vulnerabilities(self, obj):