chore(editorconfig) add .editorconfig file

Author: thibaultcha

.editorconfig

@@ -0,0 +1,18 @@
+root                     = true
+
+[*]
+end_of_line              = lf
+insert_final_newline     = false
+trim_trailing_whitespace = true
+charset                  = utf-8
+
+[*.lua]
+indent_style             = space
+indent_size              = 2
+
+[*.t]
+indent_style             = space
+indent_size              = 4
+
+[Makefile]
+indent_style             = tab