Add Justfile

Justfile

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+# List the available justfile recipes.
+@default:
+  just --list
+
+# Format, vet, and test Go code.
+check:
+	go fmt ./...
+	go vet ./...
+	GOEXPERIMENT=loopvar go test ./... -cover
+
+# Verbosely format, vet, and test Go code.
+checkv:
+	go fmt ./...
+	go vet ./...
+	GOEXPERIMENT=loopvar go test -v ./... -cover
+
+# Lint code using staticcheck.
+lint:
+	staticcheck -f stylish ./...
+
+# Test and provide HTML coverage report.
+cover:
+	go test ./... -coverprofile=coverage.out
+	go tool cover -html=coverage.out
+
+# List the outdated go modules.
+outdated:
+  go list -u -m all