chore: add VS Code workspace config with Peacock color

- launch.json: Python debugpy for bterminal.py
- tasks.json: run and install tasks
- settings.json: Peacock green workspace color, Python type checking

.vscode/launch.json

@@ -0,0 +1,11 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Launch BTerminal (v1)",
+      "type": "debugpy",
+      "request": "launch",
+      "program": "${workspaceFolder}/bterminal.py"
+    }
+  ]
+}