add minimal readme

Author: gflarity

operator/e2e/cmd/setup-debug-cluster/README.md

@@ -0,0 +1,32 @@
+# setup-debug-cluster
+
+Creates a local K3D cluster identical to the one used in E2E tests, with Grove operator and Kai scheduler pre-installed.
+
+## Usage
+
+```bash
+# From this directory
+go run .
+
+# Or build and run
+go build
+./setup-debug-cluster
+```
+
+## Options
+
+```
+--name                 Cluster name (default: "grove-e2e-cluster")
+--worker-nodes         Number of worker nodes (default: 30)
+--verbose, -v          Enable verbose logging
+--quiet, -q            Suppress non-error output
+--help                 Show all options
+```
+
+## Teardown
+
+Press `Ctrl+C` if running interactively, or:
+
+```bash
+k3d cluster delete grove-e2e-cluster
+```