Update readme with new make command info

Author: hamzakhan24-nhs

README.md

@@ -277,12 +277,27 @@ To run the Firehose integration tests:
 $ make test-firehose-integration
 ```
 
-To run the feature integration tests:
+To run all the feature integration tests:
 
 ```
 $ make test-features-integration
 ```
 
+To run indivudal feature test scenario(s) using the custom tag :
+
+1. Add "@custom_tag" before each 'Scenario' that needs to be run (in each .feature file)
+2. Run the command below:
+
+```
+$ make integration-test-with-custom_tag
+```
+
+To run all the feature integration tests and generate an interactive Allure report therafter :
+
+```
+$ make test-features-integration-report
+```
+
 ### Smoke testing
 
 For smoke tests, you need to have deployed your infrastructure (using Terraform).