Add basic instructions for HP switch

docs/SUMMARY.md

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 # Weinturm Open Air Infrastructure
 
+* [HP Switch](hp-switch.md)

docs/hp-switch.md

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+# HP Switch
+
+[ProCurve 2910al Switches Installation and Getting Started Guide](./hp-switch/Installation_Guide_HP_2910al-Serie.pdf)
+
+[HP Switch Software Basic Operation Guide](./hp-switch/HPE_c04490715_HP_Switch_Software_Basic_Operation_Guide.pdf)
+
+## Factory reset
+
+To execute the factory default reset on the switch, perform these steps:
+
+1. Using pointed objects, simultaneously press both the Reset and Clear buttons
+   on the front of the switch.
+2. Continue to press the Clear button while releasing the Reset button.
+3. When the Self Test LED begins to blink, release the Clear button.
+
+The switch will then complete its self test and begin operating with its
+configuration restored to the factory default settings.
+
+## Serial console
+
+Recommendation: use `sio` to access the serial terminal.
+
+```sh
+sudo tio --baudrate 9600 /dev/ttyS0
+```
+
+Quit with CTRL+t, q
+
+Turn pager off: `no page`
+
+Change screen length: `screen length 50`