Add .editorconfig

.editorconfig

@@ -0,0 +1,25 @@
+# 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
+trim_trailing_whitespace = true
+# Set default charset
+charset = utf-8
+
+# Matches multiple files with brace expansion notation
+
+# 4 space indentation
+[*.{py,java,r,R}]
+indent_size = 4
+
+# 2 space indentation
+[*.{js,json,yml,html,xml}]
+indent_size = 2
+
+[*.{md,Rmd}]
+trim_trailing_whitespace = false