Added .gitignore file

.gitignore

@@ -0,0 +1,43 @@
+# editor backup files
+*~
+.\#*
+\#*\#
+.\#*\#
+
+# compiler output
+*.o
+*.mod
+
+# libtool compatible files
+*.lo
+*.la
+
+# Eclipse project settings
+.cproject
+.project
+.settings/*
+
+# QtCreator project settings
+CMakeLists.txt.user*
+
+# in-tree build with CMake
+CMakeCache.txt
+CMakeFiles/
+cmake_install.cmake
+config.h
+opm-core-config.cmake
+opm-core-config-version.cmake
+opm-core-install.cmake
+Makefile
+bin/
+lib/
+Doxyfile
+Documentation/html
+dune.module
+*.pc
+install_manifest.txt
+
+# testing framework
+CTestTestfile.cmake
+DartConfiguration.tcl
+Testing/