Add tests/benchmark/README.md

tests/benchmark/README.md

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+# Azure AD Benchmarking
+
+This folder contains 3 benchmarking scripts:
+
+- [msgraphgo](msgraphgo) ... [msgraph.go](https://github.com/yaegashi/msgraph.go) program performing sequential creation/deletion
+  - Create: `time ./msgraphgo`
+  - Delete: `time ./msgraphgo -clean`
+- [msgraphtf](msgraphtf) ... Terraform script using [msgraph provider](https://github.com/yaegashi/terraform-provider-msgraph)
+  - Create: `time terraform apply -auto-approve -parallelism N`
+  - Delete: `time terraform destroy -auto-approve -parallelism N`
+- [azureadtf](azureadtf) ... Terraform script using [azuread provider](https://www.terraform.io/docs/providers/azuread/)
+  - Create: `time terraform apply -auto-approve -parallelism N`
+  - Delete: `time terraform destroy -auto-approve -parallelism N`
+
+Each script creates the following resources in Azure AD tenant:
+
+- 100 users
+- 10 groups
+- 100 group-user member relationships
+- 9 group-group member relationships
+
+|Script|Parallelism|Create (sec)|Delete (sec)|Notes|
+|---|---:|---:|---:|---|
+|msgraphgo|1|82.119|42.548||
+|msgraphtf|1|103.473|107.952|
+|msgraphtf|10|12.568|12.632|Default parallelism|
+|msgraphtf|100|7.550|7.943|
+|azureadtf|1|>1000?|?|Not yet measured|
+|azureadtf|10|125.191|12.832|Default parallelism|
+|azureadtf|100|30.266|10.745||