Add README.md for the @edgedb/create package (#849)

packages/create/README.md

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+# `@edgedb/create`: Project scaffolding for EdgeDB-backed applications
+
+The `@edgedb/create` package provides a starting point for various frameworks with everything you need to start building an EdgeDB-backed application. We aim to follow the same conventions as the original "create-app" templates, but with EdgeDB as the database. There are a few different templates to choose from, including: Next.js, Remix, Express, Node HTTP Server.
+
+Important points to note:
+
+- **Upstream changes:** We try to actively monitor and incorporate significant changes from the original "create-app" templates to to ensure developers have access to the latest features and best practices.
+- **Support for major options:** While we strive to support the major options offered by the upstream "create-apps", we might not cover every possible configuration or permutation due to the vast scope of possibilities.
+- **EdgeDB CLI installation:** For users who do not have the EdgeDB CLI installed, we automatically install it using our typical installation procedure.
+
+## Usage
+
+```bash
+$ npm create @edgedb
+# or
+yarn create @edgedb
+# or
+pnpm create @edgedb
+# or
+bun create @edgedb
+```
+
+After running the command, you will be prompted to provide a project name and choose a template. You can also specify whether to use EdgeDB Auth, initialize a git repository, and install dependencies.
+
+The tool will then create a new directory with the specified name and set up the project.
+
+## Contributing
+
+If you want to add a new template, please open an issue first. We are open to new ideas and would love to hear your feedback.
+
+### Development
+
+Install dependencies in the root directory:
+
+```bash
+$ yarn
+```
+
+Navigate into `packages/create`:
+
+```bash
+$ cd packages/create
+```
+
+Build `@edgedb/generate`
+
+```bash
+$ yarn build
+```
+
+Run a local version:
+
+```bash
+$ yarn create
+```
+
+### Testing
+
+```bash
+$ yarn test
+```