Add editorconfig + recommended extensions (#663)

Author: zoontek

.editorconfig

@@ -0,0 +1,8 @@
+root = true
+
+[*]
+charset = utf-8
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true

.vscode/extensions.json

@@ -0,0 +1,9 @@
+{
+  "recommendations": [
+    "biomejs.biome",
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "graphql.vscode-graphql",
+    "graphql.vscode-graphql-syntax"
+  ]
+}