add readme for viem matchers

[kanej]

This PR adds a few elements to allow us to include the new @nomicfoundation/hardhat-viem-matchers plugin in the template projects:

1. It adds a basic README.md that shows basic usage of each assertion function.
2. It adds the plugin to the viem toolbox
3. It adds a changeset
4. It adds the plugin to the example project to ease manual testing

The README.md is roughly based on the chai matcher reference page of the docs: https://hardhat.org/hardhat-chai-matchers/docs/reference.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8993959

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 21 packages

Name	Type
@nomicfoundation/hardhat-viem-matchers	Patch
@nomicfoundation/hardhat-toolbox-viem	Patch
hardhat	Patch
@nomicfoundation/hardhat-errors	Patch
@nomicfoundation/hardhat-ethers-chai-matchers	Patch
@nomicfoundation/hardhat-ignition	Patch
@nomicfoundation/ignition-core	Patch
@nomicfoundation/hardhat-ignition-ethers	Patch
@nomicfoundation/ignition-ui	Patch
@nomicfoundation/hardhat-ignition-viem	Patch
@nomicfoundation/hardhat-keystore	Patch
@nomicfoundation/hardhat-mocha	Patch
@nomicfoundation/hardhat-network-helpers	Patch
@nomicfoundation/hardhat-node-test-reporter	Patch
@nomicfoundation/hardhat-node-test-runner	Patch
@nomicfoundation/hardhat-test-utils	Patch
@nomicfoundation/hardhat-typechain	Patch
@nomicfoundation/hardhat-utils	Patch
@nomicfoundation/hardhat-toolbox-mocha-ethers	Patch
@nomicfoundation/hardhat-viem	Patch
@nomicfoundation/hardhat-zod-utils	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

hardhat

Total size of the bundle: 226M
Total number of dependencies (including transitive): 113

List of dependencies (sorted by size)

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