Update cheatsheets

tldr/npm-owner

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# npm-owner
+
+> Manage ownership of published packages.
+> More information: <https://docs.npmjs.com/cli/commands/npm-owner>.
+
+- Add a new user as a maintainer of a package:
+
+`npm owner add {{username}} {{package_name}}`
+
+- Remove a user from a package's owner list:
+
+`npm owner rm {{username}} {{package_name}}`
+
+- List all owners of a package:
+
+`npm owner ls {{package_name}}`