yarn: add page

pages/common/yarn.md

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+# yarn
+
+> JavaScript and Node.js package manager alternative.
+
+- Install a module globally:
+
+`yarn global add {{module_name}}`
+
+- Install all dependencies referenced in the package.json:
+
+`yarn`
+
+- Install a module and save it as a dependency to the package.json:
+
+`yarn add {{module_name}}@{{version}}`
+
+- Install a module and save it as a dev dependency to the package.json:
+
+`yarn add {{module_name}}@{{version}} --dev`
+
+- Uninstall a module and remove it from the package.json:
+
+`yarn remove {{module_name}}`
+
+- List a tree of installed modules:
+
+`yarn ls`
+
+- Interactively create a package.json file:
+
+`yarn init`
+
+- Identify why the module is installed and list other modules that depend on it:
+
+`yarn why {{module_name}}`