Added the LPSolver extension updated for NetLogo 7.0 (#81)

Author: cstaelin

extensions/lpsolver-4.1.0.zip

@@ -151,6 +151,14 @@ In general, the LevelSpace syntax has been designed to align with existing NetLo
     version: "1.0.0"
     homepage: "https://github.com/cstaelin/LinProg-Extension"
   }
+ {
+    name: "LPSolver"
+    codeName: "lpsolver"
+    shortDescription: "A mixed-integer linear programming package for NetLogo"
+    longDescription: "The LPSolver extension uses the lpsolve55 linear programming library to solve normal, integer and mixed-integer linear programming problems, returning the optimal solution and the shadow prices of the constraints."
+    version: "4.1.0"
+    homepage: "https://github.com/cstaelin/LPSolver-Extension/releases"
+  }
   {
     name: "Matrix"
     codeName: "matrix"