add credentials login with secure cookies

documentation/bruno-rest-api/LocalAPI/auth/credentials.bru

@@ -6,10 +6,17 @@ meta {
 
 post {
   url: {{BASE_URL}}/auth/credentials
-  body: none
+  body: json
   auth: inherit
 }
 
+body:json {
+  {
+    "email": "paul@cowsi.ch",
+    "password": "Password1234"
+  }
+}
+
 settings {
   encodeUrl: true
 }