Add a readme for php7

php7/README.md

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+Requirements
+------------
+
+**PHP 7:**
+
+This is usually bundled with your operating system, or fetchable using a package manager like `apt` or `homebrew`.
+
+Windows users can find the latest version here: https://windows.php.net/download#php-7.3
+
+If you want to compile from source code, that can be found here: https://www.php.net/downloads.php
+
+**Composer:**
+
+Composer is PHP's main package and dependency management tool.
+
+It can be downloaded here: https://getcomposer.org/download/
+
+Getting Started
+---------------
+
+To begin the kata, install the dependencies and run `phpunit`:
+
+```
+cd php7
+composer install
+vendor/bin/phpunit
+```
+
+If the "install" command does not work, try running `composer update` instead.
+This will tell composer that it has permission to look for a newer version of
+its dependencies.
+
+If things are still not cooperating, you can try this extreme approach:
+
+```
+composer remove phpunit/phpunit
+composer require phpunit/phpunit
+```
+
+To exercise the code outside of phpunit, for example to visually confirm that it is working,
+use the `texttest_fixture` script:
+
+```
+php fixtures/texttest_fixture.php
+```
+
+Tips
+----
+
+PHPUnit has a very thorough reference manual. It would be particularly useful to explore the
+[Data Providers](https://phpunit.readthedocs.io/en/8.1/writing-tests-for-phpunit.html#data-providers) section.