Merge pull request #836 from ethereum/doc

remix packages

docs/index.rst

@@ -30,6 +30,7 @@ Userful links:
    :maxdepth: 2
    :caption: Quick start
 
+   packages
    solidity_editor
    compile_tab
    quickstart_javascript_vm

docs/setup.md

@@ -0,0 +1,13 @@
+Packages
+========
+
+This part focuses on using `Remix IDE`, which is a browser based smart contract IDE. We will basically answer to the question: 
+Where can I use / download `Remix IDE`, and what is the difference between packages.
+
+- An online version is available at https://remix.ethereum.org. This version is stable and is updated at almost every release.
+- An alpha online version is available at https://remix-alpha.ethereum.org. This is not a stable version.
+- npm `remix-ide` package `npm install remix-ide -g`. `remix-ide` create a new instance of `Remix IDE` available at http://127.0.0.1:8080 and make the current folder available to Remix IDE by automatically starting `remixd`.
+see [Connection to `remixd`](http://remix.readthedocs.io/en/latest/tutorial_remixd_filesystem.html) for more information about sharing local file with `Remix IDE`.
+- Github release: https://github.com/ethereum/remix-ide/releases . The source code is packaged at every release but still need to be built using `npm run build`.
+- Mist: `Remix IDE` can be started and use the local geth node from `Mist` https://github.com/ethereum/mist/releases
+- Electron: `Remix IDE` wrapped as an Electron app is available at https://github.com/horizon-games/remix-app