added new links in README.md

[Krishiv-Mahajan]

This pull request adds new tutorial links to the README.md to expand the available learning resources for Karmada users. These additions provide more hands-on scenarios for users to explore key Karmada features.

New tutorial links added:

Tutorial Experience Additions:

• Added a tutorial for simulating application failover through Karmada.
• Added a tutorial demonstrating FHPA (Federated Horizontal Pod Autoscaler) usage with Karmada.
• Added a tutorial for multi-component workload scheduling in Karmada.

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[gemini-code-assist]

Code Review

This pull request updates the README.md file to add links to three new interactive tutorial scenarios on Killercoda: Application Failover, FHPA usage, and Multi-Component Workload Scheduling. The feedback suggests minor phrasing and capitalization improvements to ensure consistency and readability.

[gemini-code-assist]

The phrase 'usage using' is repetitive. Consider changing it to 'usage with' or 'Using FHPA in' to improve readability and flow.

Suggested change

	* Try [FHPA usage using Karmada](https://killercoda.com/karmada/scenario/karmada-FHPA-example).
	* Try [FHPA usage with Karmada](https://killercoda.com/karmada/scenario/karmada-FHPA-example).

[gemini-code-assist]

The project name 'Karmada' should be capitalized consistently. It is currently written in lowercase as 'karmada' in this link title.

Suggested change

	* Try [Multi-Component Workload Scheduling in karmada](https://killercoda.com/karmada/scenario/karmada-multi-component-workload-example).
	* Try [Multi-Component Workload Scheduling in Karmada](https://killercoda.com/karmada/scenario/karmada-multi-component-workload-example).