Prefer const for literals that are assigned upon declaration and not re-assigned

[Bartleby2718]

Brief description: My team prefers using consts for literals that are assigned upon declaration and not re-assigned. I'm sure there are other teams that'd agree, but I'm curious if there's an analyzer for this. If not, can we add one?

Languages applicable:

Is your analyzer C# only? VB Only? Or Both? - Both

Code example that the analyzer should report:

// before
private void PrintHelpText()
{
    var helpText = "This is how you do it."; // flag this variable because it's assigned upon declaration, not re-assigned
    Console.Write(helpText);
}

could be updated to

// after
private void PrintHelpText()
{
    const string helpText = "This is how you do it.";
    Console.Write(helpText);
}

Documentation requirements:

When this analyzer is implemented, it must be documented by following the steps at Documentation for IDE CodeStyle analyzers.