chore: import upstream snapshot with attribution

03-GettingStarted/samples/javascript/README.md

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+# Sample
+
+This is a JavaScript sample for an MCP Server
+
+Here's what the calculator portion of it looks like:
+
+```javascript
+// Define calculator tools for each operation
+server.tool(
+  "add",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => ({
+    content: [{ type: "text", text: String(a + b) }]
+  })
+);
+
+server.tool(
+  "subtract",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => ({
+    content: [{ type: "text", text: String(a - b) }]
+  })
+);
+
+server.tool(
+  "multiply",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => ({
+    content: [{ type: "text", text: String(a * b) }]
+  })
+);
+
+server.tool(
+  "divide",
+  {
+    a: z.number(),
+    b: z.number()
+  },
+  async ({ a, b }) => {
+    if (b === 0) {
+      return {
+        content: [{ type: "text", text: "Error: Cannot divide by zero" }],
+        isError: true
+      };
+    }
+    return {
+      content: [{ type: "text", text: String(a / b) }]
+    };
+  }
+);
+```
+
+## Install
+
+Run the following command:
+
+```bash
+npm install
+```
+
+## Run
+
+```bash
+npm start
+```