return the template repository URL as a JSON object (#24)

README.md

@@ -111,7 +111,12 @@ Example POST request: https://api.dev.smartclide.eu/architectural-patterns/appli
 
 ### Response 
 
-Content-Type: `text/plain`
+The template repository URL on GitHub, e.g., `https://github.com/che-samples/web-java-spring-boot`
 
-A repository URL on GitHub, e.g., `https://github.com/che-samples/web-java-spring-boot`
+Content-Type: `application/json`
 
+```json
+{
+    "templateRepositoryUrl": "https://github.com/che-samples/web-java-spring-boot"
+}
+```

src/main/java/org/eclipse/opensmartclide/architecturalpatterns/application/PatternApplicationController.java

@@ -5,11 +5,13 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.server.ResponseStatusException;
 
+import java.util.Map;
 
 @RestController
 public class PatternApplicationController {
@@ -21,15 +23,15 @@ public PatternApplicationController(final ArchitecturalPatternsJsonHandler jsonH
         this.projectJsonHandler = jsonHandler;
     }
 
-    @PostMapping(value = "/application")
-    public String applyPattern(@RequestParam("framework") String framework,
-                               @RequestParam("pattern") String pattern) {
+    @PostMapping(value = "/application", produces = MediaType.APPLICATION_JSON_VALUE)
+    public Map<String, String> applyPattern(@RequestParam("framework") String framework,
+                                            @RequestParam("pattern") String pattern) {
         try {
             String repoUrl = getProjectURL(framework, pattern);
             if (repoUrl == null) {
                 throw new NullPointerException("Repository URL is not found.");
             }
-            return repoUrl;
+            return Map.of("templateRepositoryUrl", repoUrl);
         } catch (Exception e) {
             logger.error("Exception during pattern application.", e);
             throw new ResponseStatusException(