Add EditorConfig

Closes gh-1455

Author: diguage

.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*.{adoc,bat,groovy,html,java,js,jsp,kt,kts,md,properties,py,rb,sh,sql,svg,txt,xml,xsd}]
+charset = utf-8
+
+[*.{groovy,java,kt,kts,xml,xsd}]
+indent_style = tab
+indent_size = 4
+continuation_indent_size = 8
+end_of_line = lf