Add an editorconfig-file

Author: heiglandreas

.editorconfig

@@ -0,0 +1,29 @@
+# EditorConfig is awesome: https://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
+charset = utf-8
+
+# Matches multiple files with brace expansion notation
+# Set default charset
+[*.{}]
+
+# 4 space indentation
+[*.php]
+indent_style = space
+indent_size = 4
+
+# Indentation override for all JS under lib directory
+[src/**.js]
+indent_style = space
+indent_size = 4
+
+# Matches the exact files either package.json or .travis.yml
+[{**.json,**.yml}]
+indent_style = space
+indent_size = 2