Add json-ld schema to all roadmaps

src/roadmaps/java/java.md

@@ -10,6 +10,12 @@ hasTopics: true
 dimensions:
   width: 968
   height: 1167.29
+schema:
+  headline: "Java Developer Roadmap"
+  description: "Learn how to become a Java Developer with this interactive step by step guide in 2023. We also have resources and short descriptions attached to the roadmap items so you can get everything you want to learn in one place."
+  imageUrl: "https://roadmap.sh/roadmaps/java.png"
+  datePublished: "2023-01-05"
+  dateModified: "2023-01-20"
 seo:
   title: "Learn to become a modern Java developer"
   description: "Community driven, articles, resources, guides, interview questions, quizzes for java development. Learn to become a modern Java developer by following the steps, skills, resources and guides listed in this roadmap."