add vscode extension recommendations

Author: stevefan1999-personal

.vscode/extensions.json

@@ -0,0 +1,12 @@
+{
+    "recommendations": [
+        "franneck94.vscode-rust-extension-pack",
+        "esbenp.prettier-vscode",
+        "polymeilex.rust-targets",
+        "lyonsyonii.rust-syntax",
+        "jscearcy.rust-doc-viewer",
+        "itsyaasir.rust-feature-toggler",
+        "blueglassblock.better-json5",
+        "zardoy.ts-essential-plugins"
+    ]
+}