adding Readme

Author: behnazak

README.md

@@ -35,6 +35,8 @@
 ### Dependencies
 You can use MetaOpt either with the [Gurobi optimization solver](https://www.gurobi.com/documentation/current/examples/cs_examples.html) 
 or with [Zen](https://dl.acm.org/doi/10.1145/3422604.3425930).
+NEW: MetaOpt also now supports ORTools CSIP solver. [Nuget Package Manager] (https://www.nuget.org/packages/Google.OrTools). [Caution: ORTools does not provide all the features that are available in Gurobi.]
+
 Make sure you install them. For Gurobi, you can use [NuGet Package Manager](https://www.nuget.org/packages/Gurobi.Optimizer) and run the following command:
 ```bash
 dotnet add package Gurobi.Optimizer --version 10.0.2