Update readme

Author: supermario

README.md

@@ -1,24 +1,55 @@
-For Lamdera docs, see [extra/readme.md](extra/readme.md).
+# Lamdera Elm Compiler
 
-# Elm
+Elm is [a delightful language for reliable webapps](https://elm-lang.org/).
 
-A delightful language for reliable webapps.
+The Lamdera compiler extends the official Elm compiler with tooling that works for any regular Elm frontend project, as well as specific features for Elm projects on [Lamdera: A delightful platform for full-stack Elm web apps](https://lamdera.com).
 
-Check out the [Home Page](http://elm-lang.org/), [Try Online](http://elm-lang.org/try), or [The Official Guide](http://guide.elm-lang.org/)
+The Lamdera **compiler** is free, open-source and open-contribution [un-fork of the Elm compiler](https://dashboard.lamdera.app/releases/open-source-compiler).
+
+The Lamdera **platform** is a paid service with a free tier to try, and is how we keep our work funded and sustainable.
+
+New to Elm? Check out the [Home Page](http://elm-lang.org/), [Try Online](http://elm-lang.org/try), or [The Official Guide](http://guide.elm-lang.org/).
 
 
 <br>
 
-## Install
+## Installation
+
+See [Lamdera downloads](https://dashboard.lamdera.app/docs/download) for binary and nix installations (recommended). Or if you have node, `npx lamdera` lets you try it out quickly.
+
+To uninstall, simply delete the `lamdera` binary.
+
+## Usage
+
+All `elm` commands work in Lamdera, except:
+
+- `reactor` which is replaced with `live`
+- `publish` / `bump` / `diff` are removed, continue to use `elm` for Elm package publishing
 
-✨ [Install](https://guide.elm-lang.org/install/elm.html) ✨
+See [differences](https://dashboard.lamdera.app/docs/differences) for more info.
 
-For multiple versions, previous versions, and uninstallation, see the instructions [here](https://github.com/elm/compiler/blob/master/installers/README.md).
+
+## Getting started
+
+```bash
+lamdera init
+lamdera live
+```
+
+See the [Lamdera overview](https://dashboard.lamdera.app/docs/overview) for more.
 
 <br>
 
+## Development
+
+Interested in contributing? See [extra/readme.md](extra/readme.md).
+
 ## Help
 
-If you are stuck, ask around on [the Elm slack channel][slack]. Folks are friendly and happy to help with questions!
+If you are stuck with Elm, ask around on [the Elm slack channel](http://elmlang.herokuapp.com/). Folks are friendly and happy to help with questions!
+
+For Lamdera compiler/platform discussion, see the [Lamdera Discord](https://dashboard.lamdera.app/docs/discuss).
+
+## Support
 
-[slack]: http://elmlang.herokuapp.com/
+You can support the development of the Lamdera compiler with [sponsorship](https://github.com/sponsors/supermario), by [upgrading to a paid Lamdera plan](https://dashboard.lamdera.app/docs/pricing), or by setting [feature bounties (chat with us)](https://dashboard.lamdera.app/docs/discuss).