Move pages under tldr, lint run.sh, update docs

tldr/phpunit

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# phpunit
+
+> PHPUnit command-line test runner.
+> More information: <https://phpunit.de>.
+
+- Run tests in the current directory. Note: Expects you to have a 'phpunit.xml':
+
+`phpunit`
+
+- Run tests in a specific file:
+
+`phpunit {{path/to/TestFile.php}}`
+
+- Run tests annotated with the given group:
+
+`phpunit --group {{name}}`
+
+- Run tests and generate a coverage report in HTML:
+
+`phpunit --coverage-html {{path/to/directory}}`