Update README.md

Author: xs2suruchi

README.md

@@ -8,7 +8,7 @@
 2. [Pre-requisites](#pre-requisites)
 3. [Launch Docker container](/cd3_automation_toolkit/documentation/user_guide/Launch_Docker_container.md)
 4. [Connect container to OCI Tenancy](/cd3_automation_toolkit/documentation/user_guide/Connect_container_to_OCI_Tenancy.md)
-5. [Getting Started with Automation Toolkit](/cd3_automation_toolkit/documentation/user_guide/Essentials_of_Automation_Toolkit.md)
+5. [Getting Started with Automation Toolkit](/cd3_automation_toolkit/documentation/user_guide/RunningAutomationToolkit.md)
 6. [Using the Automation Toolkit](/cd3_automation_toolkit/documentation/user_guide/Workflows.md)
    - [Green Field Tenancies](/cd3_automation_toolkit/documentation/user_guide/GreenField.md)
    - [Non-Green Field Tenancies](/cd3_automation_toolkit/documentation/user_guide/NonGreenField.md)