docs(MANUAL): add overview for input providers

References dvcrn#228

Author: dvcrn

MANUAL.md

@@ -6,6 +6,7 @@
       - [Syntax specific configuration](#syntax-specific-configuration)   
       - [Custom SPC keybinding](#custom-spc-keybinding)   
       - [Editor keymaps](#editor-keymaps)   
+   - [Editor keybindings](#editor-keybindings)   
 
 <!-- /MDTOC -->
 
@@ -88,5 +89,15 @@ As you can see, this is a very similar format that atom uses to describe it's ke
 
 So in the example above, we add a new keymap that is only available in insert mode and is getting triggered by typing `f` followed by `d`. Executing the keymap will result in vim mode jumping back to normal mode.
 
+## Editor keybindings
+
+Since v0.12.0, proton allows you to switch between a handful of keybindings. By default vim-centric keybindings are used for everything but you can easily change that inside your `~/.proton` with the `proton.core.inputProvider` setting as documented [here](https://github.com/dvcrn/proton/tree/master/src/cljs/proton/layers/core#configuration).
+
+Available modes are:
+- `vim-mode`: proton keys are on `SPC`, uses Atoms core [vim-mode](https://github.com/atom/vim-mode)
+- `vim-mode-plus` __(default)__: proton keys are on `SPC`, uses vim-mode-plus [vim-mode](https://github.com/t9md/atom-vim-mode-plus)
+- `default`: no special keybindings. proton keys are on `ALT-m`, mode keys on `CTR-ALT-m`
+- `emacs`: mirrors emacs keybindings through [atomic emacs](https://github.com/avendael/atomic-emacs). proton keys are on `ALT-m`, mode keys on `CTR-ALT-m`. (You could compare this to `holy-mode` in spacemacs, maybe.)
+
 
 _More following soon..._

README.md

@@ -6,25 +6,30 @@
 
 <!-- MDTOC maxdepth:4 firsth1:1 numbering:0 flatten:0 bullets:1 updateOnSave:1 -->
 
-   - [Proton](#proton)
-      - [What is it?](#what-is-it)
-      - [Features](#features)
-      - [Install](#install)
-         - [Pre-warning](#pre-warning)
-         - [Going full Proton](#going-full-proton)
-      - [Compiling](#compiling)
-         - [Requirements](#requirements)
-         - [Running it](#running-it)
-      - [Help](#help)
-      - [License](#license)
+   - [Proton](#proton)   
+      - [What is it?](#what-is-it)   
+      - [Usage](#usage)   
+      - [Features](#features)   
+      - [Install](#install)   
+         - [Pre-warning](#pre-warning)   
+         - [Going full Proton](#going-full-proton)   
+      - [Compiling](#compiling)   
+         - [Requirements](#requirements)   
+         - [Running it](#running-it)   
+      - [Help](#help)   
+      - [License](#license)   
 
 <!-- /MDTOC -->
 
 ### What is it?
 
 Proton *(name subject to change)* brings the modal editing style of Spacemacs and Sublimious with all its superpowers to Atom.
 
-We get rid of the annoying part of Atom — that being the configuration and package management — and __concentrate on the cool bits__: its full customisation capabilities.
+We get rid of the annoying part of Atom — that being the configuration and package management — and __concentrate on the cool bits__: its full customization capabilities.
+
+### Usage
+While not ready yet, a manual is slowly getting created [here](https://github.com/dvcrn/proton/blob/master/MANUAL.md)
+
 
 ### Features
 ##### :handbag: dotfile friendly configuration