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

tldr/composer

@@ -0,0 +1,41 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# composer
+
+> A package-based dependency manager for PHP projects.
+> More information: <https://getcomposer.org/>.
+
+- Interactively create a `composer.json` file:
+
+`composer init`
+
+- Add a package as a dependency for this project, adding an entry to `composer.json`:
+
+`composer require {{user/package}}`
+
+- Install all the dependencies in this project's `composer.json` and create `composer.lock`:
+
+`composer install`
+
+- Uninstall a package from this project, removing it as a dependency from `composer.json` and `composer.lock`:
+
+`composer remove {{user/package}}`
+
+- Update all the dependencies in this project's `composer.json` and note new versions in `composer.lock` file:
+
+`composer update`
+
+- Update only `composer.lock` after updating `composer.json` manually:
+
+`composer update --lock`
+
+- Learn more about why a dependency can't be installed:
+
+`composer why-not {{user/package}}`
+
+- Update composer to its latest version:
+
+`composer self-update`