Update readme.md to include project overview, setup instructions, directory structure, and usage with Docker for Node + TypeScript project.

tests/Greeter.test.ts

@@ -0,0 +1,16 @@
+import { describe, it, expect } from "vitest";
+import { Greeter } from "../src/core/Greeter";
+
+describe("Greeter", () => {
+  it("greets with default prefix", () => {
+    const greeter = new Greeter();
+    expect(greeter.greet("Alice")).toBe("Hello, Alice!");
+  });
+
+  it("trims name and handles empty name", () => {
+    const greeter = new Greeter("Hi");
+    expect(greeter.greet("   ")).toBe("Hi, World!");
+  });
+});
+
+