add readme

packages/create-effect-app/README.md

@@ -0,0 +1,121 @@
+# Create Effect App
+
+The `create-effect-app` command-line application is a tool which allows you to quickly bootstrap new Effect applications from either a template or from an official Effect example application.
+
+## Getting Started
+
+There are two main ways to use `create-effect-app`:
+
+### Interactive
+
+The easiest way to use `create-effect-app` is interactively via your preferred package manager:
+
+*`npm`*
+
+```sh
+npx create-effect-app [project-name]
+```
+
+*`pnpm`*
+
+```sh
+pnpm create effect-app [project-name]
+```
+
+*`yarn`*
+
+```sh
+yarn create effect-app [project-name]
+```
+
+*`bun`*
+
+```sh
+bunx create-effect-app [project-name]
+```
+
+You will then be prompted to select the type of project you want to create and customize your project with additional options (see the full [usage](#usage) documentation below).
+
+### Non-Interactive
+
+You can also invoke the `create-effect-app` CLI non-interactively:
+
+#### Usage
+
+```sh
+Create Effect App
+
+USAGE
+
+$ create-effect-app [(-t, --template basic | cli | monorepo) [--changesets] [--flake] [--prettier] [--eslint] [--workflows]] [<project-name>]
+
+$ create-effect-app [(-e, --example http-server)] [<project-name>]
+
+DESCRIPTION
+
+Create an Effect application from an example or a template repository
+
+ARGUMENTS
+
+<project-name>
+
+  A directory that must not exist.
+
+  The folder to output the Effect application code into
+
+  This setting is optional.
+
+OPTIONS
+
+(-e, --example http-server)
+
+  One of the following: http-server
+
+  The name of an official Effect example to use to bootstrap the application
+
+(-t, --template basic | cli | monorepo)
+
+  One of the following: basic, cli, monorepo
+
+  The name of an official Effect example to use to bootstrap the application
+
+--changesets
+
+  A true or false value.
+
+  Initialize project with Changesets
+
+  This setting is optional.
+
+--flake
+
+  A true or false value.
+
+  Initialize project with a Nix flake
+
+  This setting is optional.
+
+--prettier
+
+  A true or false value.
+
+  Initialize project with Prettier
+
+  This setting is optional.
+
+--eslint
+
+  A true or false value.
+
+  Initialize project with ESLint
+
+  This setting is optional.
+
+--workflows
+
+  A true or false value.
+
+  Initialize project with Effect's recommended GitHub actions
+
+  This setting is optional.
+```