Add devcontainer setup (#4143)

Co-authored-by: Angelos Bouklis <me@arjix.dev>
Co-authored-by: JellyBrick <shlee1503@naver.com>

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node-terminal",
+            "name": "Run Script: dev (pear-desktop)",
+            "request": "launch",
+            "command": "pnpm run dev",
+            "cwd": "${workspaceFolder}"
+        }
+    ]
+}