string frameworkPath = project.AddFile(Application.dataPath + "PATH_TO_FRAMEWORK/test.framework", "Frameworks/test.framework", PBXSourceTree.Source);
project.AddFileToBuild(target, frameworkPath);

string embedPhase = project.AddCopyFilesBuildPhase (target, "Embed Frameworks", "", "10");
project.AddFileToBuildSection (target, embedPhase, frameworkPath);

project.AddBuildProperty (target, "FRAMEWORK_SEARCH_PATHS", "$(SRCROOT)/PATH_TO_FRAMEWORK/");