docs: add README

README.md

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+# react-cordis
+
+Real React for Cordis, like Server Components.
+
+Heavily under constructing.
+
+## Sample
+
+```tsx
+import { useCallback, useState } from 'react'
+import { render } from 'react-cordis-notifier'
+
+export function apply(ctx: Context) {
+  render(ctx, <Counter />)
+}
+
+function Counter() {
+  const [count, setCount] = useState(0)
+
+  const increase = useCallback(() => setCount((x) => x + 1), [])
+  const decrease = useCallback(() => setCount((x) => x - 1), [])
+
+  return (
+    <>
+      <p>Current: {count}</p>
+      <button onClick={increase}>Increase</button>
+      <button onClick={decrease}>Decrease</button>
+    </>
+  )
+}
+
+```
+
+## LICENSE
+
+MIT