added symbold for AS3956 NFC Forum Compliant Dynamic Tag

Created by: cyber-murmel

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All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• Provide a URL to a datasheet for the symbol(s) you are contributing https://ams.com/documents/20143/36005/AS3956_DS000546_7-00.pdf#page=6
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library https://github.com/KiCad/kicad-footprints/blob/master/Package_DFN_QFN.pretty/DFN-10-1EP_3x3mm_P0.5mm_EP1.55x2.48mm.kicad_mod
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required
• Give a reason behind any intentional library convention rule violation.