chore: add .editorconfig

.editorconfig

@@ -0,0 +1,19 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+# code blocks in lists get confused with only 2 spaces
+indent_size = 4
+
+[*.tf]
+indent_size = 2
+
+[*.tfstate]
+indent_size = 4