Add hannoprint code

hannoprint/Marlin-2.1.2.1/config/examples/linear_axes/Octopus 8 LINEAR_AXES/README.md

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+## Octopus with 8 Linear Axes (no extruders)
+
+The axes are controlled with parameters `X`, `Y`, `Z`, `A`, `B`, `C`, `U`, and `V`.
+
+All axes in this example use the same steps/mm, acceleration, etc.
+
+NOTE: Internal to Marlin the first five additional axes are called I, J, K, U and V. However,
+the G-code parameters for extra axes are assigned using AXIS4_NAME, AXIS5_NAME, AXIS6_NAME, etc.
+
+In this example Marlin automatically maps extra axes to the unused E0, E1, E2, E3 and E4 (Z2) stepper ports.
+Endstop pins must be assigned manually, so this example assigns endstops as follows:
+
+```
+I_MIN_PIN PG11  // Z2-STOP
+J_MIN_PIN PG12  // E0DET
+K_MIN_PIN PG13  // E1DET
+U_MIN_PIN PG14  // E2DET
+V_MIN_PIN PG15  // E3DET
+```

hannoprint/Marlin-2.1.2.1/config/examples/linear_axes/RAMPS 5 LINEAR_AXES/README.md

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+## RAMPS with 5 Linear Axes (no extruders)
+
+The axes are controlled with parameters `X`, `Y`, `Z`, `U`, and `V`.
+
+All axes in this example are given the same steps/mm, acceleration, etc.
+
+NOTE: Internal to Marlin the first three additional axes are called I, J, and K. However, the
+G-code parameters for extra axes are assigned using AXIS4_NAME, AXIS5_NAME, AXIS6_NAME, etc.
+
+In this example Marlin automatically maps the extra axes to the unused E0 and E1 stepper ports.
+Endstop pins must be assigned manually, so this example assigns I_STOP_PIN and J_STOP_PIN to
+pins 65 and 66 on the AUX-2 port.