Add how to setup aws credentials for ODBC Tableau (#394)

Signed-off-by: Joshua Li <joshuali925@gmail.com>

sql-odbc/docs/user/tableau_support.md

@@ -31,7 +31,7 @@ Click on **Download** option for downloading `opensearch_sql_odbc.taco` file.
 <img src="img/tableau_select_connector.png" width=600>
 
 * Enter **Server** & **Port** value. 
-* Select required authentication option. For **AWS_SIGV4** authentication, select **Integrated Authentication** and enter value for **Region**.
+* Select required authentication option. For **AWS_SIGV4** authentication, select **Integrated Authentication** and enter value for **Region**. To setup aws access key id and secret key, create ~/.aws/credentials with [AWS CLI](https://aws.amazon.com/cli/) and use `opensearchodbc` as the profile name.
 * Use **Additional Options** section for specifying options like **FetchSize**, **ResponseTimeout**. Use `;` to separate values. For example,
 
 ```
@@ -65,4 +65,4 @@ To generate a graph,
 
 <img src="img/tableau_graph.png">
 
-* You can change visualizations by selecting any active visualization from **Show Me**.
+* You can change visualizations by selecting any active visualization from **Show Me**.