Update cheatsheets

yarn

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# yarn
+
+> JavaScript and Node.js package manager alternative.
+> More information: <https://yarnpkg.com>.
+
+- Install a module globally:
+
+`yarn global add {{module_name}}`
+
+- Install all dependencies referenced in the `package.json` file (the `install` is optional):
+
+`yarn install`
+
+- Install a module and save it as a dependency to the `package.json` file (add `--dev` to save as a dev dependency):
+
+`yarn add {{module_name}}@{{version}}`
+
+- Uninstall a module and remove it from the `package.json` file:
+
+`yarn remove {{module_name}}`
+
+- Interactively create a `package.json` file:
+
+`yarn init`
+
+- Identify whether a module is a dependency and list other modules that depend upon it:
+
+`yarn why {{module_name}}`