Add commands for monitoring disk and CPU

Guides/monitor.md

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+# Monitoring
+
+Every tip to monitor your computing units.
+
+## Processes
+
+### Instant
+
+`w`
+
+### Continuous
+
+`htop`
+
+## Disk
+
+### Instant
+
+Disk capacity
+`df -h`
+
+Disk transfert since boot
+`iostat`
+
+### Continuous
+
+`iostat -y 5`
+
+or
+
+`dstat`
+
+or
+
+`atop`