Added pfs-managed-lustre-slurm readme

[siddhartha-quad]

This PR adds pfs-managed-lustre-slurm instructions in index readme

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request expands the documentation within the HPC Toolkit by integrating a new guide for deploying a high-performance compute cluster. The added content focuses on a blueprint that combines the Slurm Workload Manager with Google Cloud Managed Service for Lustre, aiming to provide users with clear instructions for setting up such an environment.

Highlights

• Documentation for pfs-managed-lustre-slurm: Added a new section to the examples/README.md file, providing comprehensive instructions and details for the pfs-managed-lustre-slurm blueprint. This includes its purpose, integration with Slurm and Managed Lustre, and commands for provisioning and destroying the cluster.
• README Table of Contents Update: Included a new entry for pfs-managed-lustre-slurm.yaml in the table of contents of examples/README.md to ensure discoverability of the new documentation.

Changelog

• examples/README.md
  • Added a new table of contents entry for pfs-managed-lustre-slurm.yaml.
  • Included a detailed section describing the pfs-managed-lustre-slurm blueprint, its functionality, and deployment commands.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new pfs-managed-lustre-slurm.yaml example. The changes are good, but I have a few suggestions to improve the clarity and consistency of the instructions, particularly around the deployment and destruction commands. I've also pointed out a minor grammatical issue.

[gemini-code-assist]

For better readability and grammatical correctness, please rephrase this sentence.

Suggested change

	Creates a Managed Lustre file-system that is mounted in one of the slurm cluster controller instance.
	Creates a Managed Lustre file-system that is mounted on the Slurm cluster controller instance.

[siddhartha-quad]

updated as per the suggestion

[gemini-code-assist]

Since this is a multi-group deployment, it would be helpful to inform the user that they will be prompted to approve each group. Also, Please can be removed for a more direct tone, consistent with other examples.

Suggested change

	To provision the cluster, Please run below command:
	```
	./gcluster deploy examples/pfs-managed-lustre-slurm.yaml --vars "project_id=${GOOGLE_CLOUD_PROJECT}"
	```
	To provision the cluster, run the following command. You will be prompted to approve each deployment group.

./gcluster deploy examples/pfs-managed-lustre-slurm.yaml --vars "project_id=${GOOGLE_CLOUD_PROJECT}"

[siddhartha-quad]

updated as per the suggestion

[gemini-code-assist]

The placeholder deployment_name is ambiguous. For improved clarity, it's better to use a clear placeholder like <deployment_name> and explain what it refers to, which is a common pattern in this file.

Suggested change

	To destroy the cluster, Please run below command:
	```
	./gcluster destroy deployment_name
	```
	To destroy the cluster, run the following command, replacing `<deployment_name>` with the name of your deployment (e.g. `managed-lustre-slurm`):

./gcluster destroy <deployment_name>

[siddhartha-quad]

updated as per the suggestion