Add .editorconfig

.editorconfig

@@ -0,0 +1,18 @@
+# http://EditorConfig.org
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.{ts,ts.d}]
+indent_style = space
+indent_size = 2
+
+# IntelliJ Specific
+ij_javascript_spaces_within_imports = true
+ij_typescript_spaces_within_imports = true
+ij_typescript_spaces_around_arrow_function_operator = true
+ij_javascript_spaces_around_arrow_function_operator = true