Add .editorconfig

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.js]
+charset = utf-8
+
+# Tab indentation (no size specified)
+[{*.{md,json},.travis.yml}]
+indent_style = space
+indent_size = 2