update test arena

doc/user_guide.md

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+# TestArena User Guide
+
+## Getting Started
+
+### Login
+Access the TestArena dashboard and log in with your credentials. Default admin credentials are `admin` / `admin123`.
+
+### Submitting a New Job
+1. Click the **+ New Job** button on the dashboard.
+2. Enter the **Branch Name** you want to test and click **Validate Branch**.
+3. Select the test scenarios you want to include in the job.
+4. Review your selection and click **Submit Job**.
+
+## Monitoring Jobs
+
+### Dashboard
+The dashboard shows a list of all test jobs. You can see the status (Waiting, In Progress, Passed, Failed, Aborted) and who submitted the job.
+
+### Job Details
+Click on a job to view its details:
+- **Scenario Summary**: Shows the status of each individual scenario in the job.
+- **Queue Logging**: Real-time logs from the execution queue.
+
+### Searching
+Use the search boxes in the sidebar to find jobs by **Job ID** or **Username**. Admins can see all jobs, while regular users see their own by default.
+
+## Managing Jobs
+
+### Aborting a Job
+If a job is running, you can abort it by clicking the **Abort** button in the job details or via the right-click context menu in the job list.
+
+### Deleting a Job
+To remove a job from the history and the remote server, click the **Delete** button in the job details or via the right-click context menu.