style(vscode): add EditorConfig extension recommendation

As Visual Studio Code is the most popular editor at the moment, it makes
sense to recommend the EditorConfig extension because it's not included
by default. Also enable the final newline in files again as that was the
default until the EditorConfig file was added.

.vscode/.gitignore

@@ -0,0 +1,3 @@
+/*
+!/.gitignore
+!/extensions.json

.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "editorconfig.editorconfig"
+    ]
+}