Add sponsorship information to Readme

README.md

@@ -8,13 +8,16 @@ By
 [Nicolas Lemoine](https://github.com/nlemoine) ([@nlemoine](https://niconico.fr/)),
 [Erik van der Bas](https://github.com/Levdbas) ([website](https://basedonline.nl/)),
 [Coby Tamayo](https://github.com/acobster) ([@cobytamayo](https://keybase.io/acobster)),
-[Upstatement](https://twitter.com/upstatement) and [hundreds of other GitHub contributors](https://github.com/timber/timber/graphs/contributors)
+[Upstatement](https://twitter.com/upstatement) and [hundreds of other GitHub contributors](https://github.com/timber/timber/graphs/contributors):
+
+[![](https://opencollective.com/timber/contributors.svg?width=900&button=false)](https://github.com/timber/timber/graphs/contributors)
 
 [![Build Status](https://img.shields.io/travis/timber/timber/master?style=flat-square)](https://app.travis-ci.com/github/timber/timber/branches)
 [![Coverage Status](https://img.shields.io/coveralls/timber/timber.svg?style=flat-square)](https://coveralls.io/github/timber/timber)
 [![Scrutinizer Code Quality](https://img.shields.io/scrutinizer/g/timber/timber.svg?style=flat-square)](https://scrutinizer-ci.com/g/timber/timber/?branch=master)
 [![Latest Stable Version](https://img.shields.io/packagist/v/timber/timber.svg?style=flat-square)](https://packagist.org/packages/timber/timber)
 [![WordPress Rating](https://img.shields.io/wordpress/plugin/r/timber-library.svg?style=flat-square)](https://wordpress.org/support/plugin/timber-library/reviews/)
+[![!Financial Contributors](https://opencollective.com/timber/tiers/badge.svg)](https://opencollective.com/timber/)
 
 ### Because WordPress is awesome, but the_loop isn't
 Timber helps you create fully-customized WordPress themes faster with more sustainable code. With Timber, you write your HTML using the [Twig Template Engine](https://twig.symfony.com/) separate from your PHP files.
@@ -105,15 +108,13 @@ Timber is great for any WordPress developer who cares about writing good, mainta
 * [**Timmy**](https://github.com/MINDKomm/Timmy) Advanced image manipulation for Timber
 
 
-
 #### Projects that use Timber
 * [**Branch**](https://github.com/JeyKeu/branch/) Bootstrap 3 + Timber = Branch starter theme!
 * [**Flynt**](https://flyntwp.com/) a component based WordPress starter theme built on Timber and ACF Pro
 * [**Gantry5**](https://wordpress.org/plugins/gantry5/) a framework for theme development
 * [**Hozokit**](https://github.com/csalmeida/hozokit) a component based starter theme
 * [**Seedling**](https://github.com/maxdmyers/seedling) a starter theme using Bootstrap 4
 
-
 #### Helpful Links
 * [**CSS Tricks**](https://css-tricks.com/timber-and-twig-reignited-my-love-for-wordpress/) introduction to Timber by [@tjFogarty](https://github.com/tjFogarty)
 * [**Twig for Timber Cheatsheet**](http://notlaura.com/the-twig-for-timber-cheatsheet/) by [@laras126](https://github.com/laras126)
@@ -124,11 +125,41 @@ Timber is great for any WordPress developer who cares about writing good, mainta
 Please post on [StackOverflow under the "Timber" tag](http://stackoverflow.com/questions/tagged/timber). Please use GitHub issues _only_ for specific bugs, feature requests and other types of issues.
 
 #### Should I use it?
-It's MIT-licensed, so please use in personal or commercial work. Just don't re-sell it. Timber is used on [tens of thousands of sites](https://www.upstatement.com/timber/#showcase) (and tons more we don't know about)
+Timber is MIT-licensed, so please use in personal or commercial work. Just don't re-sell it. Timber is used on [tens of thousands of sites](https://www.upstatement.com/timber/#showcase) (and tons more we don't know about)
 
 #### Contributing & Community
 We love PRs! Read the [Contributor Guidelines](https://github.com/timber/timber/blob/master/CONTRIBUTING.md) for more info. Say hello, share your tips/work, and spread the love on Twitter at [@TimberWP](https://twitter.com/TimberWP).
 
+## Sponsor us
+
+Since 2013 our goal at Timber is to create a library to that helps you create fully-customized WordPress themes _faster_ with more _sustainable code_.
+
+Through the collaborative efforts of both our dedicated team and countless contributors, we have invested numerous hours in maintaining and enhancing Timber. To keep doing that, we rely on the invaluable support of our sponsors.
+
+Are you a WordPress pro or part of an agency who relies on Timber? Keep the magic alive by [becoming a sponsor](https://opencollective.com/timber)! By becoming a sponsor, you contribute to the continuous maintenance and enhancement of Timber, ultimately benefiting developers worldwide.
+
+![](https://opencollective.com/timber/tiers/bronze-sponsor.svg?avatarHeight=36&limit=0&button=true)
+
+### Gold Sponsors
+
+![](https://opencollective.com/timber/tiers/gold-sponsor.svg?avatarHeight=36&button=false)
+
+<!-- Enable when available.
+### Silver Sponsors
+
+![](https://opencollective.com/timber/tiers/sponsors.svg?avatarHeight=36?avatarHeight=36&button=false)
+-->
+
+<!-- Enable when available.
+### Basic Sponsors
+
+![](https://opencollective.com/timber/tiers/bronze-sponsor.svg?avatarHeight=36&button=false)
+-->
+
+### Our backers
+
+![](https://opencollective.com/timber/tiers/backers.svg?avatarHeight=36&button=false)
+
 ## Documentation
 
 The Official [Documentation for Timber](https://timber.github.io/docs/) is generated from the contents of this repository: