Update USER_GUIDE.md - Githubissues

This PR includes the following changes:

Updated instructions for installation and setup of GoVPP.
Revised documentation for generating Go code bindings for the VPP API.
Added instructions for connecting to the VPP API using synchronous and asynchronous methods.
Expanded information on sending API messages using the Channel and Stream client.
Included documentation on utilizing the HTTP service for making API calls.
Added instructions for working with the RPC client.
Revised documentation for working with the stats API, including retrieving system and node stats.
Added information on managing stats directories.
Included code snippets and examples throughout the User Guide to demonstrate usage.

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FDio / govpp