Add content to usage page

docs/getting_started/usage.md

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+# Usage overview
+
+The Usage page provides users with a comprehensive overview of their data consumption and performance metrics associated with their communities. This feature is essential for understanding resource allocation and ensuring compliance with the usage policy. 
+
+From this page, users can access detailed analytics regarding their analyzed bytes by community, as well as all executed playbook actions. 
+
+## How it works
+
+### Single-tenant communities
+
+The Usage page is accessible from the `Settings` section. On this page, users are presented with a dashboard containing the following widgets: 
+
+- **Analyzed bytes**: An overview of the analyzed bytes for this community. The progress bar shows the following:
+    - Current: Actual data usage for this community for the current month. 
+    - Projected: An estimate of the data volume that is anticipated to be transmitted over a month. It is calculated based on analyzing past data usage trends. 
+- **Executed Playbook actions**: Total number of playbook actions taken based on playbooks in this community. 
+- **Date selector**: In the top right corner of the page, it allows users to browse and analyze consumption data by month.
+
+For communities with the `Intelligence plan` only, there are no widgets yet, but new ones should be implemented soon. 
+
+### Multi-tenant communities 
+
+As members of a workspace, users can quickly review consumption metrics across all of their communities. In addition to the previously described widgets, a summary table lists the following information: 
+
+- **Community name**
+- **Number of subscribed assets**: Total subscribed assets in each community (based on what has been defined in your contract with Sekoia). 
+- **Type of subscription**: The subscription plan type.
+- **Analyzed bytes**: The amount of data analyzed by month, applicable to your plan.
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mkdocs.yml

@@ -61,6 +61,7 @@ nav:
     - Create and manage notifications: getting_started/notifications-Listing_Creation.md
     - Notification examples: getting_started/notifications-Examples.md
   - API Keys: getting_started/manage_api_keys.md
+  - Usage: getting_started/usage.md
   - Sekoia regions: getting_started/regions.md
   - Best practices: getting_started/best_practices.md
   - Troubleshooting tips: getting_started/get_troubleshooting_tips.md