adding url for instructions for getting credentials in the error

Author: mediumTaj

Scripts/Services/AlchemyAPI/v1/AlchemyAPI.cs

@@ -90,7 +90,7 @@ public AlchemyAPI(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide an apikey to use the Alchemy API.");
+                throw new WatsonException("Please provide an apikey to use the Alchemy API. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/Conversation/v1/Conversation.cs

@@ -95,7 +95,7 @@ public Conversation(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Conversation service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Conversation service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/Discovery/v1/Discovery.cs

@@ -106,7 +106,7 @@ public Discovery(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Discovery service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Discovery service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/DocumentConversion/v1/DocumentConversion.cs

@@ -77,7 +77,7 @@ public DocumentConversion(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Document Conversion service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Document Conversion service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/LanguageTranslation/v2/LanguageTranslation.cs

@@ -104,7 +104,7 @@ public LanguageTranslation(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Language Translation service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Language Translation service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/LanguageTranslator/v2/LanguageTranslator.cs

@@ -116,7 +116,7 @@ public LanguageTranslator(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Language Translator service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Language Translator service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/NaturalLanguageClassifier/v2/NaturalLanguageClassifier.cs

@@ -76,7 +76,7 @@ public NaturalLanguageClassifier(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Natural Language Classifier service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Natural Language Classifier service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/NaturalLanguageUnderstanding/v1/NaturalLanguageUnderstanding.cs

@@ -89,7 +89,7 @@ public NaturalLanguageUnderstanding(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Natural Language Understanding service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Natural Language Understanding service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/PersonalityInsights/v3/PersonalityInsights.cs

@@ -91,7 +91,7 @@ public PersonalityInsights(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Personality Insights service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Personality Insights service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion

Scripts/Services/RetrieveAndRank/v1/RetrieveAndRank.cs

@@ -100,7 +100,7 @@ public RetrieveAndRank(Credentials credentials)
             }
             else
             {
-                throw new WatsonException("Please provide a username and password or authorization token to use the Retrieve and Rank service.");
+                throw new WatsonException("Please provide a username and password or authorization token to use the Retrieve and Rank service. For more information, see https://github.com/watson-developer-cloud/unity-sdk/#configuring-your-service-credentials");
             }
         }
         #endregion