Add: ResponseBody and ResponseBodyBuilder classes for building response body

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/response/ResponseBody.java

@@ -0,0 +1,19 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.response;
+
+import java.util.List;
+
+public class ResponseBody {
+    private final List<ResponseNode> nodes;
+
+    ResponseBody(List<ResponseNode> nodes) {
+        this.nodes = List.copyOf(nodes);
+    }
+
+    public static ResponseBodyBuilder builder() {
+        return new ResponseBodyBuilder();
+    }
+
+    public List<ResponseNode> nodes() {
+        return nodes;
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/response/ResponseBodyBuilder.java

@@ -0,0 +1,25 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.response;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Consumer;
+
+public class ResponseBodyBuilder {
+    private final List<ResponseNode> nodes = new ArrayList<>();
+
+    public ResponseBodyBuilder param(String key, Object value) {
+        nodes.add(new ResponseParameter(key, value));
+        return this;
+    }
+
+    public ResponseBodyBuilder block(String tag, Consumer<ResponseBodyBuilder> content) {
+        ResponseBodyBuilder childBuilder = new ResponseBodyBuilder();
+        content.accept(childBuilder);
+        nodes.add(new ResponseBlock(tag, childBuilder.build().nodes()));
+        return this;
+    }
+
+    public ResponseBody build() {
+        return new ResponseBody(nodes);
+    }
+}