doc: add manpage for npm-org

doc/cli/npm-org.md

@@ -0,0 +1,50 @@
+npm-org(1) -- Manage orgs
+===================================
+
+## SYNOPSIS
+
+    npm org set <orgname> <username> [developer | admin | owner]
+    npm org rm <orgname> <username>
+    npm org ls <orgname> [<username>]
+
+## EXAMPLE
+
+Add a new developer to an org:
+```
+$ npm org set my-org @mx-smith
+```
+
+Add a new admin to an org (or change a developer to an admin):
+```
+$ npm org set my-org @mx-santos admin
+```
+
+Remove a user from an org:
+```
+$ npm org rm my-org mx-santos
+```
+
+List all users in an org:
+```
+$ npm org ls my-org
+```
+
+List all users in JSON format:
+```
+$ npm org ls my-org --json
+```
+
+See what role a user has in an org:
+```
+$ npm org ls my-org @mx-santos
+```
+
+## DESCRIPTION
+
+You can use the `npm org` commands to manage and view users of an organization.
+It supports adding and removing users, changing their roles, listing them, and
+finding specific ones and their roles.
+
+## SEE ALSO
+
+* [Documentation on npm Orgs](https://docs.npmjs.com/orgs/)