feat(dev): add xdebug launch config

Author: themightychris

Diff for: .vscode/launch.json

@@ -0,0 +1,22 @@
+
+{
+    // 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": [
+        {
+            "name": "Listen for XDebug",
+            "type": "php",
+            "request": "launch",
+            "port": 9000,
+            "pathMappings": {
+                "/hab/svc/php-runtime/var/site": "${workspaceRoot}"
+            },
+            "ignore": [
+                "**/vendor/**/*.php",
+                "**/src-compat/File.php"
+            ]
+        }
+    ]
+}