docs: update docs since module rename

README.md

 # slog
 
-Go module for structured logging.
+Go module for nexus telemetry.
+
+Initially contains a logger, but expected to contain mechanisms for timing and metrics in future.
+
+## Components
+
+### logger
 
 Configures a logger with a JSON formatter using a schema suitable for datadog log ingestion.
 
-## Example usage
+## Development
 
-Initialise and use the logger:
+Run tests with:
 
 ```
-go run src/main/main.go
+go test
 ```