Add launch config for tests

.vscode/launch.json

+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Hardhat test",
+            "type": "node",
+            "request": "launch",
+            "console": "integratedTerminal",
+            "runtimeExecutable": "npm",
+            "runtimeArgs": [
+                "test",
+                "${workspaceFolder}/test/Voting.test.js"
+            ]
+        }
+    ]
+}
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