Add Converter_DCDC_Murata_MEE3SxxxxSC_THT

[chschlue]

https://www.murata.com/products/productdata/8807029702686/kdc-mee3.pdf

https://github.com/KiCad/kicad-footprints/blob/master/Converter_DCDC.pretty/Converter_DCDC_Murata_MEE3SxxxxSC_THT.kicad_mod

easyw/kicad-3d-models-in-freecad#369

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Thanks for creating a pull request to contribute to the KiCad libraries!
Remember you must be the legal owner of the 3D model! Models downloaded from a manufacturers website cannot be accepted.

To speed up integration of your PR, please check the following items as you complete them:

• A screenshot of the model(s) aligned with KiCad footprint(s)
• Source files are contributed on the apropriate location
  • Link to the package3d-source pull request or to the script pull request
• Step model submitted in 1:1 scale
• WRL model submitted in 1:2.54 scale
• 3D model alignment checked against KiCad footprint
• WRL model uses correct material properties
• Geometry check performed on the model

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Be patient, we maintainers are volunteers with limited time and need to check your contribution against the datasheet. You can speed up the process by providing all the necessary information (see above).