Add DEVELOPMENT.md for internal guidelines

DEVELOPMENT.md

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+# Weaverse SDKs Development
+
+These instructions are for internal Weaverse development. If you're looking to contribute to the Weaverse SDKs, please refer to the [Contribution Guidelines](./CONTRIBUTING.md).
+
+## Workflow
+
+We currently use [pnpm](https://pnpm.io) to develop our SDKs.
+
+1. **Fork & Clone**: Fork this repository and clone it to your local machine.
+
+2. **Install Dependencies**: Navigate to the desired package or sample project and install dependencies:
+
+   ```bash
+   pnpm install
+   ```
+
+3. **Run Development Server**: Start the development server:
+   ```bash
+   pnpm run dev
+   ```
+
+## Releases
+
+We're using [Changesets](https://github.com/changesets/changesets) to manage our releases. When you're ready to begin the
+release process, follow these steps:
+
+1. Run `pnpm changeset` to create a new changeset.
+2. Run `pnpm changeset version` to bump the version of the packages that need to be upgraded.
+3. Run `pnpm changeset publish` to publish the new version of the packages to `npm`.
+4. Commit and push the changes to the `main` branch.
+5. Release the new version of the packages on GitHub.