Improve IDE / editor config

- add .vscode/extensions.json
- configure *.json/*.jsonc for 2 spaces indentation

Author: mhoffrog

.editorconfig

@@ -10,7 +10,7 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[*.{yml,yaml}]
+[*.{json,jsonc,yml,yaml}]
 indent_size = 2
 
 [{vendor,inc/phpseclib}/**]

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+  "recommendations": [
+    "bmewburn.vscode-intelephense-client",
+    "eamodio.gitlens",
+    "editorconfig.editorconfig",
+    "esbenp.prettier-vscode",
+    "github.vscode-github-actions",
+    "samuelhinchliffe.phpdoc-generator-2022"
+  ]
+}