feat(openthread): adds examples README.md files

[SuGlider]

Description of Change

Adds README.md file for each Arduino OpenThread Library example.

Test Scenarios

CI Only

Related links

None

[github-actions]

	Messages
📖	This PR seems to be quite large (total lines of code: 1748), you might consider splitting it into smaller PRs

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[Copilot]

Pull Request Overview

This PR adds comprehensive README documentation for all OpenThread library examples in the ESP32 Arduino Core. The documentation covers both Native API and CLI-based examples, providing users with detailed setup instructions, configuration guidance, and troubleshooting information.

Key Changes

• Added README files for Native API examples (LeaderNode, RouterNode)
• Added README files for CLI examples (SimpleCLI, SimpleNode, ThreadScan, onReceive, Leader/Router/ExtendedRouter nodes)
• Added README files for CoAP examples (coap_lamp, coap_switch)

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
libraries/OpenThread/examples/Native/SimpleThreadNetwork/RouterNode/README.md	Documentation for Router/Child node using Native Classes API
libraries/OpenThread/examples/Native/SimpleThreadNetwork/LeaderNode/README.md	Documentation for Leader node using Native Classes API
libraries/OpenThread/examples/CLI/onReceive/README.md	Documentation for CLI callback mechanism demonstration
libraries/OpenThread/examples/CLI/ThreadScan/README.md	Documentation for IEEE 802.15.4 and Thread network scanning
libraries/OpenThread/examples/CLI/SimpleThreadNetwork/RouterNode/README.md	Documentation for Router/Child node using CLI Helper Functions
libraries/OpenThread/examples/CLI/SimpleThreadNetwork/LeaderNode/README.md	Documentation for Leader node using CLI Helper Functions
libraries/OpenThread/examples/CLI/SimpleThreadNetwork/ExtendedRouterNode/README.md	Documentation for extended Router node with dual API demonstration
libraries/OpenThread/examples/CLI/SimpleNode/README.md	Documentation for automatic Thread network initialization
libraries/OpenThread/examples/CLI/SimpleCLI/README.md	Documentation for interactive OpenThread CLI console
libraries/OpenThread/examples/CLI/COAP/coap_switch/README.md	Documentation for CoAP client (switch) implementation
libraries/OpenThread/examples/CLI/COAP/coap_lamp/README.md	Documentation for CoAP server (lamp) implementation

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[Copilot]

Spelling error: "CHANEL" should be "CHANNEL"

Suggested change

	#define CLI_NETWORK_CHANEL "dataset channel 24"
	#define CLI_NETWORK_CHANNEL "dataset channel 24"

[Copilot]

Spelling error: "CHANEL" should be "CHANNEL"

Suggested change

	#define CLI_NETWORK_CHANEL "dataset channel 24"
	#define CLI_NETWORK_CHANNEL "dataset channel 24"

[Copilot]

Spelling error: "CHANEL" should be "CHANNEL"

Suggested change

	#define CLI_NETWORK_CHANEL "24"
	#define CLI_NETWORK_CHANNEL "24"