Update README.md to use correct location of InMemoryEventStore

[RamAnanth]

Modified the README.md file to use the correct location of inMemoryEventStore to address #365

Motivation and Context

This change solves an issue with running the current example streamable HTTP servers provided in the README file leading to correct usage of the provided examples

How Has This Been Tested?

Breaking Changes

Types of changes

• [x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• [ x] Documentation update

Checklist

• [ x] I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• [ x] I have added or updated documentation as needed

Additional context

[2noScript]

It is located in the examples directory; is that correct?

[ihrpr]

I'd rather remove it entirely, in memory store is just for testing, it should not be used in production, as it really depends on how the server is deployed.

[RamAnanth]

That makes sense, I will remove the usage of in memory event store completely from both the examples in the README file

[ihrpr]

thank you!

[simonedstrom96]

The line

    const eventStore = new InMemoryEventStore();

still persists in the readme, leading to confusion