Add documentation PI HAT Connection

[mariolukas]

• power jack polarity
• wireing diagram
• laser secure switch (bridge)
• jst connector polartity (howto connect led stripe/ring)
• silent step stick driver configuration/assembly
• howto test connectivity
• troubleshooting section

[jenshackel]

This will be my next "construction site".

[Cysign]

• Add info about voltage/maximum current for the laser connectors

• Add instructions to setup the stepper current properly

• Add checklist 'before you turn on your machine'

[Cysign]

• Add information if a resistor for an DIY-WS2812 strip is needed on the signal

• Does the Hat deliver power to the Pi?

• Add: Use some tape on audiojack & hdmi port to properly isolate hat from Pi !

[mariolukas]

Thank you for your suggestions, we will add those points to the hardware related docs.