docs: add quotas (#4366)

docs/admin/enterprise.md

@@ -5,10 +5,10 @@ Contact sales@coder.com to obtain a license.
 
 Our Enterprise-only features include:
 
-- Audit Logging
+- [Audit Logging](./audit-logs.md)
 - Browser Only Connections
 - Template RBAC
-- Quotas
+- [Quotas](./quotas.md)
 - High Availability
 
 ## Adding your license key

docs/admin/quotas.md

@@ -0,0 +1,25 @@
+# Quotas
+
+<blockquote class="info">
+Workspace Quotas are only available in the Enterprise Edition.
+</blockquote>
+
+Coder Enterprise admins may define deployment-level quotas to protect against
+Denial-of-Service, control costs, and ensure equitable access to cloud resources.
+
+The quota is enabled by either the `CODER_USER_WORKSPACE_QUOTA`
+environment variable or the `--user-workspace-quota` flag. For example,
+you may limit each user in a deployment to 5 workspaces like so:
+
+```bash
+coder server --user-workspace-quota=5
+```
+
+Then, when users create workspaces they would see:
+
+<img src="../images/admin/quotas.png"/>
+
+## Up next
+
+- [Enterprise](./enterprise.md)
+- [Configuring](./configure.md)