diff --git a/README.md b/README.md
index 8e7bd57..6e9114d 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@
     - [Attendance WebApp UI](#attendance-webapp-ui)
   - [Refer to the Wiki for details on the project](#refer-to-the-wiki-for-details-on-the-project)
 - [Project general guidelines](#project-general-guidelines)
+  - [API/Services Architectures](#apiservices-architectures)
+  - [Extra mermaid diagram](#extra-mermaid-diagram)
   - [Setup](#setup)
   - [Build Web Package](#build-web-package)
     - [Maven Build](#maven-build)
@@ -72,6 +74,28 @@ To find out more, visit:
 3. Latest releases by using git tags
 4. API references. API docs
 
+## API/Services Architectures
+```mermaid
+graph LR
+    REST --> JSON
+    REST --> XML
+    REST --> Webhooks
+    REST --> gRPC
+    REST --> GraphQL
+    REST --> WebSockets
+    gRPC --> Protobuf
+    GraphQL --> Queries
+    GraphQL --> Mutations
+    WebSockets --> Full-duplex-communication
+    WebSockets --> Real-time-updates
+    Webhooks --> HTTP-callbacks
+    Webhooks --> Event-driven-architecture
+```
+## Extra mermaid diagram
+circular references
+
+[![](https://mermaid.ink/img/pako:eNptksEOgjAQRH-F7Fl-gIMXNV4wUTDx0kulKxCEklIOhvDvtmAoXeypfTOdySY7QCYFQgS54m0RxAlrAnOSU3oPwnAf5Mn1QNDZOm8xoQ98pjKrUHdboZCyMngWbOIkWAdBXvRCafRa8KJ_30n6mrpx1pQWEM3rcF5SQwTXRARvRqL9KZve2yqHvSKHaY1TXCfsoEZV81KYBRislYEusEYGkbkKrioGrBmNj_dapp8mg-jF3x3uoG8F13gsuVmceqEoSi3VZV6pabPGL4act8s?type=png)](https://mermaid.live/edit#pako:eNptksEOgjAQRH-F7Fl-gIMXNV4wUTDx0kulKxCEklIOhvDvtmAoXeypfTOdySY7QCYFQgS54m0RxAlrAnOSU3oPwnAf5Mn1QNDZOm8xoQ98pjKrUHdboZCyMngWbOIkWAdBXvRCafRa8KJ_30n6mrpx1pQWEM3rcF5SQwTXRARvRqL9KZve2yqHvSKHaY1TXCfsoEZV81KYBRislYEusEYGkbkKrioGrBmNj_dapp8mg-jF3x3uoG8F13gsuVmceqEoSi3VZV6pabPGL4act8s)
+
 ## Setup
 > Tested in Win11 with WSL, Github codespaces and Ubuntu22
 
diff --git a/src/main/java/clients/GraphQL/GraphQLClient.java b/src/main/java/clients/GraphQL/GraphQLClient.java
new file mode 100644
index 0000000..e9fc8f3
--- /dev/null
+++ b/src/main/java/clients/GraphQL/GraphQLClient.java
@@ -0,0 +1,31 @@
+import com.graphql.java.client.GraphQLClient;
+import com.graphql.java.client.GraphQLClientBuilder;
+import com.graphql.java.client.GraphQLRequest;
+import com.graphql.java.client.GraphQLResponse;
+
+public class GraphQLClient {
+
+    private final GraphQLClient graphQLClient;
+
+    public GraphQLClientExample(String graphQLAPIEndpointURL) {
+        graphQLClient = GraphQLClientBuilder.newClient(graphQLAPIEndpointURL).build();
+    }
+
+    public GraphQLResponse executeQuery(String query) {
+        GraphQLRequest graphQLRequest = new GraphQLRequest(query);
+        return graphQLClient.execute(graphQLRequest);
+    }
+
+    public static void main(String[] args) {
+        GraphQLClientExample graphQLClientExample = new GraphQLClientExample("https://graphql.example.com");
+
+        // Execute a GraphQL query
+        GraphQLResponse graphQLResponse = graphQLClientExample.executeQuery("{ hello }");
+
+        // Parse the GraphQL response
+        String hello = graphQLResponse.getData().get("hello").toString();
+
+        // Print the result
+        System.out.println(hello);
+    }
+}
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