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
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+
+[*.{c,cppi,cc,h,hpp}]
+indent_size = 2
+
+# Tab indentation (no size specified)
+[Makefile,makefile,GNUmakefile]
+indent_style = tab
+
+#[*.{js,py}]