Dotnet 4.0 setup instructions

1) Add practo.dll as a reference in your project 2) Install NuGet package manager in Visual Studio, if not already present 3) Go to package manager console, Install the NuGet packages in the following order a) Install-Package Microsoft.Bcl.Async -Source -Version 1.0.168 b) Install-Package Microsoft.Net.Http -Source -Version 2.2.29 c) Install-Package Newtonsoft.Json -Source -Version 9.0.1