Add installation links and development info to README

README.md

@@ -1,14 +1,52 @@
-# GitKraken Browser extension
+# GitKraken Browser Extension
+
+## Installation
+
+[Google Chrome](https://chromewebstore.google.com/detail/gitkraken/egmopflbpgdjmmkeabegohajillnebco)
+
+[Microsoft Edge](https://microsoftedge.microsoft.com/addons/detail/gitkraken/eehliiniplilmbgcnghhaneefihofjnl)
+
+[Mozilla Firefox](https://addons.mozilla.org/en-US/firefox/addon/gitkraken-browser-extension)
 
 ## Features
 
 - Adds an "Open with GitKraken" option to the `Code` dropdowns on GitHub
 - Adds a "Checkout with GitKraken" option to the `Code` dropdowns on pull requests on GitHub
 - Adds a "Open with GitKraken" button to commit pages on GitHub
 
-## Installation
+## Latest Preview
 
 - Grab the latest release from the [Releases](https://github.com/gitkraken/gitkraken-browser/releases) page
 - Go to the extensions page in your browser, e.g. `chrome://extensions` or `edge://extensions`
 - Enable "Developer mode"
 - Drag the downloaded zip file, `gitkraken-browser*.zip`, and drop it onto the extensions page
+
+## Development
+
+Building this project requires [Node.js](https://yarnpkg.com) and [Yarn](https://yarnpkg.com).
+
+### Install dependencies
+
+```sh
+yarn
+```
+
+### Developing for Chrome/Edge:
+
+```sh
+yarn build:chromium
+# OR
+yarn watch:chromium
+```
+
+Open `chrome://extensions/` or `edge://extensions/`, enable Developer Mode, then drag the `gk-browser-extension` folder onto the page to install the extension.
+
+### Developing for Firefox:
+
+```sh
+yarn build:firefox
+# OR
+yarn watch:firefox
+```
+
+Open `about:debugging#/runtime/this-firefox`, click "Load Temporary Add-on", then select any file in the root of the `gk-browser-extension` folder.