Add EditorConfig (#3126)

.editorconfig

@@ -0,0 +1,17 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+root = true
+
+[*]
+charset = utf-8
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{sh,json}]
+indent_size = 4
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.vscode/extensions.json

@@ -1,5 +1,6 @@
 {
     "recommendations": [
+        "editorconfig.editorconfig",
         "ms-vscode-remote.remote-containers",
         "rebornix.ruby"
     ]