marking optional exercises on this page since its missing

Author: neelamegams

exercises/ex2-SAP-Build-Apps/README.md

@@ -6,9 +6,9 @@ This section of exercises focuses on SAP Build Apps, specifically the creation o
 
 * [Exercise 2.1 - Create SAP Build App to Trigger Workflow](/exercises/ex2-SAP-Build-Apps/ex2.1/README.md)
 
-* [Exercise 2.2 - Populate Dropdown with SAP Data (ES5)](/exercises/ex2-SAP-Build-Apps/ex2.2/README.md) 
+* [Exercise 2.2 - Populate Dropdown with SAP Data (ES5)](/exercises/ex2-SAP-Build-Apps/ex2.2/README.md) (Optional)
 
-* [Exercise 2.3 - Check Status of Process from SAP Build App](/exercises/ex2-SAP-Build-Apps/ex2.3/README.md) 
+* [Exercise 2.3 - Check Status of Process from SAP Build App](/exercises/ex2-SAP-Build-Apps/ex2.3/README.md) (Optional)
 
 * [Exercise 2.4 - Deploy SAP Build App to SAP BTP](/exercises/ex2-SAP-Build-Apps/ex2.4/README.md)