feat: add rules for playwright (!3)

Reviewed-on: https://codeberg.org/nhcarrigan/eslint-config/pulls/3
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

test/playwright.spec.ts

@@ -0,0 +1,21 @@
+/**
+ * @copyright nhcarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { describe, expect, it } from "vitest";
+import { playwrightRules } from "../src/rules/playwright.ts";
+
+describe("playwright configs", () => {
+  it("should never be an error", () => {
+    expect.assertions(42);
+    const rules = Object.entries(playwrightRules);
+    for (const [ name, rule ] of rules) {
+      expect(Array.isArray(rule)
+        ? rule.at(0)
+        : rule, `${name} appears to be set to an error!`).not.toBe("error");
+      continue;
+    }
+  });
+});