add new cpp file to python

Author: galabovaa

HiGHS.sln

@@ -0,0 +1,24 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.2.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Highs", "nuget\Highs.csproj", "{906CCF22-9F98-849C-F4C4-760DF67E239A}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{906CCF22-9F98-849C-F4C4-760DF67E239A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{906CCF22-9F98-849C-F4C4-760DF67E239A}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{906CCF22-9F98-849C-F4C4-760DF67E239A}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{906CCF22-9F98-849C-F4C4-760DF67E239A}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {9CBD3313-5290-4CF1-BD96-67956BC4EB05}
+	EndGlobalSection
+EndGlobal

cmake/sources-python.cmake

@@ -183,6 +183,7 @@ set(hipo_sources_python
     highs/ipm/hipo/ipm/Iterate.cpp
     highs/ipm/hipo/ipm/LogHighs.cpp
     highs/ipm/hipo/ipm/Model.cpp
+    highs/ipm/hipo/ipm/Refine.cpp
     highs/ipm/hipo/ipm/Solver.cpp)
 
 set(hipo_headers_python