rust: pin-init: add miscellaneous files from the user-space version

Add readme and contribution guidelines of the user-space version of
pin-init.

Signed-off-by: Benno Lossin <[email protected]

rust: pin-init: add miscellaneous files from the user-space version

Add readme and contribution guidelines of the user-space version of
pin-init.

Signed-off-by: Benno Lossin <[email protected]>
Reviewed-by: Fiona Behrens <[email protected]>
Reviewed-by: Andreas Hindborg <[email protected]>
Tested-by: Andreas Hindborg <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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