Update cheatsheets

xo

@@ -0,0 +1,29 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# xo
+
+> A pluggable, zero-configuration linting utility for JavaScript.
+> More information: <https://github.com/xojs/xo>.
+
+- Lint files in the "src" directory:
+
+`xo`
+
+- Lint a given set of files:
+
+`xo {{path/to/file1.js path/to/file2.js ...}}`
+
+- Automatically fix any lint issues found:
+
+`xo --fix`
+
+- Lint using spaces as indentation instead of tabs:
+
+`xo --space`
+
+- Lint using the "prettier" code style:
+
+`xo --prettier`