add back minimal vscode settings file for rust-analyzer

Author: ludfjig

.gitignore

@@ -448,6 +448,7 @@ $RECYCLE.BIN/
 ## Visual Studio Code
 ##
 .vscode/*
+!.vscode/settings.json
 
 /downloads
 

.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+    "rust-analyzer.linkedProjects": [
+        "Cargo.toml", 
+        // guest crates for testing, not part of the workspace
+        "src/tests/rust_guests/simpleguest/Cargo.toml",
+        "src/tests/rust_guests/callbackguest/Cargo.toml"
+    ]
+}