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+Use Docker to easily try out or contribute to the sendgrid-php library. 
+
+This Docker image contains:
+ - PHP 7.1.16
+ - A running instance of [Stoplight.io's Prism](https://stoplight.io/platform/prism/), which lets you try out the Twilio SendGrid API without actually sending email
+ - A mirrored copy of sendgrid-php so that you may develop locally and then run the tests within the Docker container.
+
+# Table of Contents
+
+* [Quick Start](#quick-start)
+* [Testing](#testing)
+* [Contributing](#contributing)
+
+<a name="quick-start"></a>
+# Quick Start
+
+0. Install Composer:
+  - `php -r "readfile('https://getcomposer.org/installer');" | php`
+  - `mv composer.phar /usr/local/bin/composer`
+1. Clone the sendgrid-php repo
+  - `git clone https://github.com/sendgrid/sendgrid-php.git`
+  - `cd sendgrid-php`
+  - `composer install`
+2. [Install Docker](https://docs.docker.com/install/)
+3. [Setup local environment variable SENDGRID_API_KEY](https://github.com/sendgrid/sendgrid-php#setup-environment-variables)
+4. Build Docker image, run Docker container, login to the Docker container
+  - `docker image build --tag="sendgrid/php7" ./docker`
+  - `docker run -itd --name="sendgrid_php7" -v $(pwd):/root/sendgrid-php sendgrid/php7 /bin/bash`
+5. Run the tests within the Docker container
+  - `docker exec -it sendgrid_php7 /bin/bash -c 'cd sendgrid-php/test; ../vendor/bin/phpunit . --filter test*; exec "${SHELL:-sh}"'`
+
+Now you can continue development locally, and run `../vendor/bin/phpunit . --filter test*` inside of the container to test. Replace `test*` with the name of a particular test if you do not wish to run the entire suite of tests.
+
+To clean up the container: `docker stop sendgrid_php7 && docker rm sendgrid_php7`.
+
+Happy Hacking! 
+
+<a name="testing"></a>
+# For Testing the Library (Kick the Tires)
+
+- After step 5 in the QuickStart, within the Docker container: 
+  - `cd ../`
+  - `php sendmail.php` 
+
+<a name="contributing"></a>
+# For Contributors
+
+- Develop per usual locally, but before pushing up to GitHub, you can run the tests locally in the Docker container per step 5 of the quickstart.
+- To run all the tests: `../vendor/bin/phpunit . --filter test*`
+- To run an individual test: `../vendor/bin/phpunit . --filter [Name of Test]`