…h Map interface

This pull request introduces a newuseLocalStorageMap composable to manage reactiveMap objects synchronized withlocalStorage. The key changes include the implementation of the composable, documentation, a demo, and comprehensive test coverage.

Implementation ofuseLocalStorageMap:

• Added theuseLocalStorageMap composable inindex.ts, which provides a reactiveMap interface backed bylocalStorage. It uses a custom serializer to handle the conversion betweenMap and JSON.

Documentation and Examples:

• Createdindex.md to document theuseLocalStorageMap composable, including its usage, API, and example code snippets.
• Added a demo indemo.vue to showcase the functionality ofuseLocalStorageMap, including adding, deleting, and displaying key-value pairs.

Testing:

• Added unit tests inindex.test.ts to ensure the correctness ofuseLocalStorageMap under various scenarios, such as basic usage, handling empty maps, non-string keys, complex objects as values, and options likelistenToStorageChanges.

Before submitting the PR, please make sure you do the following

• Read theContributing Guidelines.
• Read thePull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresseswhat the PR is solving, or reference the issue that it solves (e.g.fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

Description

Additional context