feat(docs): license management (#5015)

* licensing documentation

How to bind license in XOA

* Update license-management.md

* Add files via upload

license activation image

* fix links

* fix wording

* adding license management in menu

* Update license-management.md

docs/SUMMARY.md

@@ -68,6 +68,7 @@
   - [Reseller](reseller.md)
   - [Editions](editions.md)
   - [Trial](trial.md)
+  - [License Management](license-management.md)
   - [Invoices](invoices.md)
   - [Upgrade](upgrade.md)
 - [XOSAN](xosan.md)

docs/license-management.md

@@ -0,0 +1,18 @@
+# License management
+This section will cover the license management system for commercial editions of our products. 
+
+## Activate a Xen Orchestra license
+
+1. After the [purchase](purchase.md), all your available licenses will be visible in the license section of your appliance.
+
+2. All the licenses available and not bind already will be displayed here with a green `activate license` button
+
+![](./assets/activate-license.png)
+
+3. By clicking on the activate license option, you will be required to confirm your choice. 
+
+![](./assets/activate-confirm.png)
+
+:::warning
+Once a license is bind, the only way to unbind it is to contact us with a [support ticket](https://xen-orchestra.com/#!/member/support)!
+:::