chore: add information on other modules (#132)

Author: vedantthapa

README.md

@@ -1,9 +1,11 @@
 # terraform-google-cloud-operations
 
 This module is a collection of submodules related to Google Cloud Operations (Logging and Monitoring):
-- [Agent Policy](https://github.com/terraform-google-modules/terraform-google-cloud-operations/blob/master/modules/agent-policy/README.md)
 
-This module is only compatible with Linux and OS X. It cannot be run on Windows.
+- [Agent Policy (Beta)](https://github.com/terraform-google-modules/terraform-google-cloud-operations/blob/master/modules/agent-policy/README.md)
+  - This module is only compatible with Linux and OS X. It cannot be run on Windows.
+- [Ops Agent Policy (GA)](https://github.com/terraform-google-modules/terraform-google-cloud-operations/blob/master/modules/ops-agent-policy/README.md)
+- [Simple Uptime Check](https://github.com/terraform-google-modules/terraform-google-cloud-operations/blob/master/modules/simple-uptime-check/README.md)
 
 ## Usage