docs(README): update and add quickstart

README.md

@@ -1,2 +1,107 @@
+[![Gitter](https://badges.gitter.im/nvim-treesitter/community.svg)](https://gitter.im/nvim-treesitter/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
 # nvim-treesitter
-Nvim Treesitter configurations and abstraction layer
+Treesitter configurations and abstraction layer for Neovim.
+
+# Quickstart
+
+## Requirements
+  - Neovim nightly ([more](https://github.com/neovim/neovim#install-from-source))
+  - `git` in you path.
+  - A C compiler in you path.
+
+## Installation
+
+You can install `nvim-treesitter` with you favorite package manager, or even using the default `pack` feature of neovim !
+
+### Using a package manager
+
+Simply add these lines to your `init.vim` :
+```vim
+Plug 'nvim-treesitter/nvim-treesitter'
+```
+
+### Using neovim `pack` feature
+
+As this is a bit more advanced, we highly recommend reading `:h packages`, but you can also follow these steps:
+```sh
+$ mkdir -p ~/.local/share/nvim/site/pack/nvim-treesitter/start
+$ cd ~/.local/share/nvim/site/pack/nvim-treesitter/start
+$ git clone https://github.com/nvim-treesitter/nvim-treesitter.git
+```
+
+## Adding parsers
+
+Treesitter is based on a _parser_ for each language. Installing them can be quite a pain, but fortunately `nvim-treesitter` provides two
+command to tackle this for you :
+  - `TSInstall` to install a given parser.
+  - `TSInstallInfo` to know which parser is installed.
+
+Let's say you want to have a parser for `lua`, `c`, and `python`, here is how to use the commands :
+```vim
+:TSInstall c
+Downloading...
+Compiling...
+Treesitter parser for c has been installed
+
+:TSInstall lua
+Downloading...
+Compiling...
+Treesitter parser for lua has been installed
+
+:TSInstall python
+Downloading...
+Compiling...
+Treesitter parser for python has been installed
+```
+
+Cool, let's check which parser is installed now:
+```vim
+:TSInstallInfo
+csharp     [✗] not installed
+html       [✗] not installed
+typescript [✗] not installed
+c          [✓] installed
+swift      [✗] not installed
+java       [✗] not installed
+python     [✓] installed
+cpp        [✗] not installed
+lua        [✓] installed
+ruby       [✗] not installed
+ocaml      [✗] not installed
+go         [✗] not installed
+rust       [✗] not installed
+json       [✗] not installed
+javascript [✗] not installed
+css        [✗] not installed
+julia      [✗] not installed
+php        [✗] not installed
+bash       [✗] not installed
+tsx        [✗] not installed
+```
+
+And now you should be able to use every functionnality `nvim-treesitter` provides !
+
+## Features and Roadmap
+
+The goal of `nvim-treesitter` is both to provide a simple and easy to use interface to treesitter in neovim, and to add some
+functionnalities to use it out of the box.
+Some of these features are :
+  - [ ] Incremental selection
+  - [ ] Syntax based code folding
+  - [ ] Consistent syntax highlighting
+
+You can find the roadmap [here](https://github.com/nvim-treesitter/nvim-treesitter/projects/1). This roadmap and all features
+of this plugin are everything but definitively determined, and any suggestion will be highly apreciated !
+
+## Troubleshooting
+Before doing anything run `:checkhealth nvim_treesitter`. This will give a better overview of which part of the plugin is the
+source of the bug.
+
+### Feature `X` does not work for language `Y`...
+First, check in the `## Y parser healthcheck` section of `:checkhealth` if you have any warning.
+If you do, it is highly possible that this is the cause of the problem.
+If everything is okay, then it might be an actual error.
+
+In both cases, feel free to open an issue here.
+
+