chore: enter alpha prerelease mode

- Add .changeset/pre.json (tag: alpha)
- Add README.md stubs for client and server packages so npm pages aren't blank

Author: felixweinberger

.changeset/pre.json

@@ -0,0 +1,24 @@
+{
+  "mode": "pre",
+  "tag": "alpha",
+  "initialVersions": {
+    "@modelcontextprotocol/eslint-config": "2.0.0",
+    "@modelcontextprotocol/tsconfig": "2.0.0",
+    "@modelcontextprotocol/vitest-config": "2.0.0",
+    "@modelcontextprotocol/examples-client": "2.0.0-alpha.0",
+    "@modelcontextprotocol/examples-client-quickstart": "2.0.0-alpha.0",
+    "@modelcontextprotocol/examples-server": "2.0.0-alpha.0",
+    "@modelcontextprotocol/examples-server-quickstart": "2.0.0-alpha.0",
+    "@modelcontextprotocol/examples-shared": "2.0.0-alpha.0",
+    "@modelcontextprotocol/client": "2.0.0-alpha.0",
+    "@modelcontextprotocol/core": "2.0.0-alpha.0",
+    "@modelcontextprotocol/express": "2.0.0-alpha.0",
+    "@modelcontextprotocol/hono": "2.0.0-alpha.0",
+    "@modelcontextprotocol/node": "2.0.0-alpha.0",
+    "@modelcontextprotocol/server": "2.0.0-alpha.0",
+    "@modelcontextprotocol/test-conformance": "2.0.0-alpha.0",
+    "@modelcontextprotocol/test-helpers": "2.0.0-alpha.0",
+    "@modelcontextprotocol/test-integration": "2.0.0-alpha.0"
+  },
+  "changesets": []
+}

packages/client/README.md

@@ -0,0 +1,20 @@
+# `@modelcontextprotocol/client`
+
+The MCP (Model Context Protocol) TypeScript client SDK. Build MCP clients that connect to MCP servers.
+
+> [!NOTE] This is **v2** of the MCP TypeScript SDK. It replaces the monolithic `@modelcontextprotocol/sdk` package from v1. See the **[migration guide](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/docs/migration.md)** if you're coming from v1.
+
+## Install
+
+```bash
+npm install @modelcontextprotocol/client@alpha zod
+```
+
+`zod` is a required peer dependency.
+
+## Documentation
+
+- **[Repository README](https://github.com/modelcontextprotocol/typescript-sdk#readme)** — overview, package layout, examples
+- **[Client guide](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/docs/client.md)**
+- **[API reference](https://ts.sdk.modelcontextprotocol.io/v2/)**
+- **[MCP specification](https://modelcontextprotocol.io)**

packages/server/README.md

@@ -0,0 +1,23 @@
+# `@modelcontextprotocol/server`
+
+The MCP (Model Context Protocol) TypeScript server SDK. Build MCP servers that expose tools, resources, and prompts.
+
+> [!NOTE] This is **v2** of the MCP TypeScript SDK. It replaces the monolithic `@modelcontextprotocol/sdk` package from v1. See the **[migration guide](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/docs/migration.md)** if you're coming from v1.
+
+## Install
+
+```bash
+npm install @modelcontextprotocol/server@alpha zod
+```
+
+`zod` is a required peer dependency.
+
+Optional framework adapters: [`@modelcontextprotocol/express`](https://www.npmjs.com/package/@modelcontextprotocol/express), [`@modelcontextprotocol/hono`](https://www.npmjs.com/package/@modelcontextprotocol/hono),
+[`@modelcontextprotocol/node`](https://www.npmjs.com/package/@modelcontextprotocol/node).
+
+## Documentation
+
+- **[Repository README](https://github.com/modelcontextprotocol/typescript-sdk#readme)** — overview, package layout, examples
+- **[Server guide](https://github.com/modelcontextprotocol/typescript-sdk/blob/main/docs/server.md)**
+- **[API reference](https://ts.sdk.modelcontextprotocol.io/v2/)**
+- **[MCP specification](https://modelcontextprotocol.io)**