Add a basic README

Author: nick-jones

README.md

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+# fluxcd-suspend-notifier
+
+Application that watches for suspend status changes of fluxcd resources. This is designed to operate in the context of 
+fluxcd running in a GKE cluster.
+
+- GKE audit logs are tailed to observe when fluxcd resources are mutated. We use this mechanism specifically as it  
+  contains details of the user that has made the modification
+- The kubernetes API is used to check if the suspend status has changed (resource modifications can occur for other
+  reasons)
+- If the suspend status has changed, a notification is dispatched via Slack