Add readme for examples

Author: ije

examples/feature-apps/monaco-editor/README.md

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+# Monaco Editor
+
+A web IDE written in Aleph.js, powered by [Monaco Editor](https://microsoft.github.io/monaco-editor/), deploy to [Deno Deploy](https://deno.com/deploy):
+
+https://aleph-monaco-editor.deno.dev/

examples/feature-apps/suspense-ssr/README.md

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+# Suspense SSR
+
+A demo for [New Suspense SSR Architecture in React 18](https://github.com/reactwg/react-18/discussions/37) with Aleph.js data fetching, deploy to [Deno Deploy](https://deno.com/deploy):
+
+https://aleph-suspense-ssr.deno.dev/
+
+> This demo is artificially slowed down. Open routes/index.tsx to adjust how much different things are slowed down.

examples/feature-apps/unocss/README.md

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+# UnoCSS
+
+Meet the builtin **atomic css** of Aleph.js, powered by [UnoCSS](https://github.com/unocss/unocss), deploy to [Deno Deploy](https://deno.com/deploy):
+
+https://aleph-unocss.deno.dev/

examples/react-app/README.md

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+# React App
+
+A React demo application powered by Aleph.js in Deno, deploy to [Deno Deploy](https://deno.com/deploy):
+
+https://aleph-hello.deno.dev/

examples/vue-app/README.md

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+# Vue App
+
+A Vue demo application powered by Aleph.js in Deno, deploy to [Deno Deploy](https://deno.com/deploy):
+
+https://aleph-vue.deno.dev/