URI extension method to add parameters

[jtorreguitar]

Summary:

Adding a parameter to a uri using the existing URI class is verbose and long-winded. A new class was added that provides and extension method for adding these parameters in a simple way. Note that it will throw an exception if used with relative uris as it uses the URIBuilder class which does not support this type of uri.

Sample usage:

URI uri = new URI(Client.BaseAddress + ControllerBaseURL)
            .AddParameter("categoryId", "0")
            .AddParameter("ageRangeId", "0")
            .AddParameter("pageSize", $"{count}");