Update Readme with steps for using mobcat-library packages

[Sweekriti91]

• Update current readme with steps to use packages
• Update readme build badges with new pipelines

[alexeystrakh]

We can add pre-configuted nuget source file leaving the secrets away:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <packageSources>
        <clear />
        <add key="github" value="https://nuget.pkg.github.com/xamcat/index.json" />
    </packageSources>
    <packageSourceCredentials>
        <github>
            <add key="Username" value="<YOU_USERNAME>" />
            <add key="ClearTextPassword" value="<YOU_ACCESS_TOKEN" />
        </github>
    </packageSourceCredentials>
</configuration>

But like Sweeky noticed, this is all in GitHub docs and this is one of 3 approaches to connect nuget source so probably make sense just to add a link on how to configure sources and not to add such a file into the repo.