Add editor config

.editorconfig

@@ -0,0 +1,24 @@
+# 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
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.{js,py}]
+charset = utf-8
+
+# Indentation override for all JS under lib directory
+[app/**.js]
+indent_style = space
+indent_size = 4
+
+# Matches the exact files either package.json or .travis.yml
+[package.json]
+indent_style = space
+indent_size = 4