Add PC requirements for schools

docs/pc-requirements.md

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+# PC requirements
+
+**Linux compatible only**
+
+| Component   | Minimum specifications  |
+| ----------- | ----------------------- |
+| Processor   | x86-64 (64 bits)        |
+| Memory      | 8 GB                    |
+| Disk        | 120 GB SSD              |
+| Monitor     | Full HD resolution      |
+| Motherboard | UEFI & PXE boot support |
+
+## Other considerations
+
+-   The monitor must be flicker-free (no PWM) to preserve the student's attention & eye health
+-   To avoid damaging the PC ports, all cables (USB, Audio) must be connected to cheaper and easier to replace extension cables.
+-   Energy consumption is an important criterion to be taken into account