chore: Add editorconfig setup file

.editorconfig

@@ -0,0 +1,23 @@
+root                     = true
+
+[*]
+end_of_line              = lf
+insert_final_newline     = true
+trim_trailing_whitespace = true
+charset                  = utf-8
+
+[*.{lua,rockspec}]
+indent_style             = space
+indent_size              = 4
+
+[Makefile]
+indent_style             = tab
+indent_size              = 4
+
+[*.html]
+indent_style             = space
+indent_size              = 4
+
+[*.{c,h}]
+indent_style             = space
+indent_size              = 4