Add launch configuration for debugging (#619)

Author: vinistock

.vscode/launch.json

@@ -0,0 +1,25 @@
+{
+    // 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": "ruby_lsp",
+            "name": "Debug script",
+            "request": "launch",
+            "program": "ruby ${file}"
+        },
+        {
+            "type": "ruby_lsp",
+            "name": "Debug test",
+            "request": "launch",
+            "program": "ruby -Itest ${relativeFile}"
+        },
+        {
+            "type": "ruby_lsp",
+            "name": "Attach debugger",
+            "request": "attach"
+        }
+    ]
+}