feat: Add package READMEs

packages/react-debug-tools/README.md

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+# `react-debug-tools`
+
+This is an experimental package for debugging React renderers.
+
+**Its API is not as stable as that of React, React Native, React DOM, or React Roblox, and does not follow the common versioning scheme.**
+
+**Use it at your own risk.**

packages/react-is/README.md

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+# `react-is`
+
+**NOTE:** This README is copied directly from React upstream.
+
+This package allows you to test arbitrary values and see if they're a particular React element type.
+
+## Installation
+
+```sh
+# Yarn
+yarn add react-is
+
+# NPM
+npm install react-is
+```
+
+## Usage
+
+### Determining if a Component is Valid
+
+```js
+import React from "react";
+import * as ReactIs from "react-is";
+
+class ClassComponent extends React.Component {
+  render() {
+    return React.createElement("div");
+  }
+}
+
+const FunctionComponent = () => React.createElement("div");
+
+const ForwardRefComponent = React.forwardRef((props, ref) =>
+  React.createElement(Component, { forwardedRef: ref, ...props })
+);
+
+const Context = React.createContext(false);
+
+ReactIs.isValidElementType("div"); // true
+ReactIs.isValidElementType(ClassComponent); // true
+ReactIs.isValidElementType(FunctionComponent); // true
+ReactIs.isValidElementType(ForwardRefComponent); // true
+ReactIs.isValidElementType(Context.Provider); // true
+ReactIs.isValidElementType(Context.Consumer); // true
+ReactIs.isValidElementType(React.createFactory("div")); // true
+```
+
+### Determining an Element's Type
+
+#### Context
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+const ThemeContext = React.createContext("blue");
+
+ReactIs.isContextConsumer(<ThemeContext.Consumer />); // true
+ReactIs.isContextProvider(<ThemeContext.Provider />); // true
+ReactIs.typeOf(<ThemeContext.Provider />) === ReactIs.ContextProvider; // true
+ReactIs.typeOf(<ThemeContext.Consumer />) === ReactIs.ContextConsumer; // true
+```
+
+#### Element
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isElement(<div />); // true
+ReactIs.typeOf(<div />) === ReactIs.Element; // true
+```
+
+#### Fragment
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isFragment(<></>); // true
+ReactIs.typeOf(<></>) === ReactIs.Fragment; // true
+```
+
+#### Portal
+
+```js
+import React from "react";
+import ReactDOM from "react-dom";
+import * as ReactIs from 'react-is';
+
+const div = document.createElement("div");
+const portal = ReactDOM.createPortal(<div />, div);
+
+ReactIs.isPortal(portal); // true
+ReactIs.typeOf(portal) === ReactIs.Portal; // true
+```
+
+#### StrictMode
+
+```js
+import React from "react";
+import * as ReactIs from 'react-is';
+
+ReactIs.isStrictMode(<React.StrictMode />); // true
+ReactIs.typeOf(<React.StrictMode />) === ReactIs.StrictMode; // true
+```

packages/react-roblox/README.md

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+# `react-roblox`
+
+This package serves as a Roblox renderer for React. It is intended to be paired with the generic React package, which is shipped as `core-packages/react` to Wally.
+
+## Usage
+
+```lua
+local React = require(Path.To.React)
+local ReactRoblox = require(Path.To.ReactRoblox)
+
+local function App()
+    return React.createElement("TextLabel", {
+        Text = "Hello, world!"
+    })
+end
+
+local element = React.createElement(App)
+
+local root = ReactRoblox.createRoot(Instance.new("Folder"))
+root:render(ReactRoblox.createPortal(element, playerGui))
+```
+
+## API
+
+TODO

packages/react/README.md

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+# `react`
+
+React is a library for creating user interfaces.
+
+The `react` package contains only the functionality necessary to define React components. It is typically used together with a React renderer like `react-roblox`.
+
+## Usage
+
+```lua
+local React = require(Path.To.React)
+local ReactRoblox = require(Path.To.ReactRoblox)
+
+local e = React.createElement
+local useState = React.useState
+
+local function Counter()
+    local count, setCount = useState(0)
+
+    return e("Frame", {}, {
+        CurrentCount = e("TextLabel", {
+            Text = count,
+            ...
+        }),
+        IncrementButton = e("TextButton", {
+            Text = "Increment",
+            ...,
+
+            [React.Event.Activated] = function()
+                setCount(count + 1)
+            end
+        })
+    })
+end
+
+local root = ReactRoblox.createRoot(Instance.new("Folder"))
+root:render(ReactRoblox.createPortal(e(Counter), playerGui))
+```
+
+## Documentation
+
+See https://react.dev/
+
+## API
+
+See https://react.dev/reference/react

packages/roact-compat/README.md

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+# `roact-compat`
+
+This package serves as a compatibility bridge between `react` and legacy [`Roact`](https://github.com/Roblox/roact). It can be used when migrating an existing codebase to React, but new code shouldn't use this package.
+
+## API
+
+TODO

packages/scheduler/README.md

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+# `scheduler`
+
+This is a package for cooperative scheduling in a Lua environment. It is currently used internally by React, but we plan to make it more generic.
+
+The public API for this package is not yet finalized.