Minor readability fixes
Minor readability fixes

Changed phrasing of "just added" to "recently added".
Updated sentence structure in Getting Started section to add clarity (usage of "either" was in a single sentence so I adjusted to improve readability)
dubrovkinmaxim/sendgrid-csharp,sendgrid/sendgrid-csharp,sendgrid/sendgrid-csharp,dubrovkinmaxim/sendgrid-csharp,sendgrid/sendgrid-csharp