Add .editorconfig

.editorconfig

@@ -0,0 +1,23 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+[*]
+end_of_line = crlf
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+[*.{proj,props,sln,targets,sql}]
+indent_style = tab
+
+[*.{dna,config,nuspec,csproj,vcxproj,vcproj,targets,ps1,resx}]
+indent_size = 2
+
+[*.{cpp,h,def}]
+indent_style = tab
+
+[*.{dotsettings}]
+end_of_line = lf