feat: add EditorConfig configuration

In order to support a more consistent formatting, this change adds
a [EditorConfig](https://editorconfig.org/) configuration file
`.editorconfig`.

.editorconfig

@@ -0,0 +1,65 @@
+# https://editorconfig.org/
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[/docker-compose/nginx/**/*.conf]
+indent_size = 2
+
+[/docker-compose/wazuh/**/*.conf]
+indent_size = 2
+
+[*.css]
+indent_size = 2
+
+[{*.go,go.mod}]
+indent_style = tab
+indent_size = unset
+
+[*.hcl]
+indent_size = unset
+
+[*{.min,.min.*,-min}.js]
+charset = unset
+indent_size = unset
+indent_style = unset
+insert_final_newline = unset
+max_line_length = off
+
+[*.json]
+indent_size = 2
+
+[*.md]
+indent_size = unset
+trim_trailing_whitespace = false
+
+[*.nix]
+indent_size = 2
+
+[*.py]
+indent_size = 4
+
+[*.tf]
+indent_size = unset
+
+[/packer/**/http/user-data]
+indent_size = 2
+
+[{*.{yaml,yml},.yamllint}]
+indent_size = 2
+
+[*.xml]
+indent_size = 2
+
+[Makefile]
+indent_style = tab
+indent_size = unset
+
+[Vagrantfile]
+indent_size = 2