update README.md

Author: jbytecode

README.md

@@ -54,15 +54,7 @@ This page includes both the API documentation and examples.
 
 # How to contribute
 
-Please 
-
-- First open an issue and share you idea 
-- Discuss what is your purpose, what is the implementation details 
-- Please provide tests from text books and any other problems that the result is known
-- Use methods of `solve()` function if possible. That requires defining a structure of the given problem
-- Define a struct to hold the solution
-- The solution may rely on linear programming or other efficient algorithms such like in the transportation problem
-
+Please read the page [Contributing](https://github.com/jbytecode/OperationsResearchModels.jl/blob/main/CONTRIBUTING.md) before contributing.
 
 # Notes for the users