docs: add examples for discovery v2

Author: mamoonraja

Examples/ExampleDiscoveryV2.cs

@@ -0,0 +1,81 @@
+using IBM.Watson.Discovery.V2;
+using IBM.Watson.Discovery.V2.Model;
+using IBM.Cloud.SDK.Utilities;
+using IBM.Cloud.SDK.Authentication;
+using IBM.Cloud.SDK.Authentication.Bearer;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using IBM.Cloud.SDK;
+
+public class ExampleDiscoveryV2 : MonoBehaviour
+{
+    #region PLEASE SET THESE VARIABLES IN THE INSPECTOR
+    [Space(10)]
+    [Tooltip("The Bearer Token.")]
+    [SerializeField]
+    private string bearerToken;
+    [Tooltip("The service URL (optional). This defaults to \"https://gateway.watsonplatform.net/discovery/api\"")]
+    [SerializeField]
+    private string serviceUrl;
+    [Tooltip("The version date with which you would like to use the service in the form YYYY-MM-DD.")]
+    [SerializeField]
+    private string versionDate;
+    #endregion
+
+    private DiscoveryService service;
+    // Start is called before the first frame update
+    void Start()
+    {
+        LogSystem.InstallDefaultReactors();
+        Runnable.Run(CreateService());
+    }
+
+    // Update is called once per frame
+    public IEnumerator CreateService()
+    {
+        if (string.IsNullOrEmpty(bearerToken))
+        {
+            throw new IBMException("Plesae provide Bearer Token for the service.");
+        }
+
+        // Option 1
+        //  Create credential and instantiate service using bearer token
+        BearerTokenAuthenticator authenticator = new BearerTokenAuthenticator(bearerToken: bearerToken);
+
+        // Otions 2
+        //  Create credential and instantiate service using username/password
+        // var authenticator = new CloudPakForDataAuthenticator(
+        //     url: "https://{cpd_cluster_host}{:port}",
+        //     username: "{username}",
+        //     password: "{password}"
+        // );
+
+        //  Wait for tokendata
+        while (!authenticator.CanAuthenticate())
+            yield return null;
+
+        service = new DiscoveryService(versionDate, authenticator);
+        service.SetServiceUrl("service_url");
+
+
+        Runnable.Run(ExampleListCollections());
+    }
+
+    private IEnumerator ExampleListCollections()
+    {
+        Log.Debug("DiscoveryServiceV2", "ListCollections");
+        ListCollectionsResponse listCollectionsResponse = null;
+        service.ListCollections(
+            callback: (DetailedResponse<ListCollectionsResponse> response, IBMError error) =>
+            {
+                Log.Debug("DiscoveryServiceV2", "ListCollections result: {0}", response.Response);
+                listCollectionsResponse = response.Result;
+            },
+            projectId: "{project_id}"
+        );
+
+        while (listCollectionsResponse == null)
+            yield return null;
+    }
+}

Examples/ExampleDiscoveryV2.cs.meta

@@ -12,6 +12,7 @@ Use this SDK to build Watson-powered applications in Unity.
   * [Before you begin](#before-you-begin)
   * [Getting the Watson SDK and adding it to Unity](#getting-the-watson-sdk-and-adding-it-to-unity)
     * [Installing the SDK source into your Unity project](#installing-the-sdk-source-into-your-unity-project)
+  * [Discovery v2 only on CP4D](#discovery-v2-only-on-cp4d)
   * [Configuring your service credentials](#configuring-your-service-credentials)
   * [Authentication](#authentication)
   * [Watson Services](#watson-services)
@@ -43,6 +44,9 @@ You can get the latest SDK release by clicking [here][latest_release_sdk]. **You
 ### Installing the SDK source into your Unity project
 Move the **`unity-sdk`** and **`unity-sdk-core`** directories into the **`Assets`** directory of your Unity project. _Optional: rename the SDK directory from `unity-sdk` to `Watson` and the Core directory from `unity-sdk-core` to `IBMSdkCore`_.
 
+## Discovery v2 only on CP4D
+
+Discovery v2 is only available on Cloud Pak for Data.
 
 ## Configuring your service credentials
 To create instances of Watson services and their credentials, follow the steps below.