Create CONTRIBUTING.md

Author: SeunMatt

CONTRIBUTING.md

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+Contributing
+============
+
+Found a bug? Wanna Implement a missing feature? Or you have a suggestion or two;
+just create an issue with a description of your intentions and we can start from there.
+
+Running The Tests
+=================
+Your environment should be setup for php development.
+I used [Laragon]() as my local environment while building the package.
+
+To run the tests:
+- fork the repo
+- clone the your fork of the repo
+- run `composer install` in the root dir of the cloned repo
+- set up the config as specified in the README
+- then run
+```
+"./vendor/bin/phpunit"
+```
+Implementing Mising Feature
+===========================
+Before attempting to implement a new feature, first create an issue about it and check to ensure nobody else is working on it.