train-car-tank-outline and train-car-container-full

[andrejsharapov]

Before submitting a new icon contribution, please confirm the following:

• [X] I have searched all issues to make sure there isn't a request for this icon.
• [X] I have searched the current library to make sure the icon doesn't already exist.
• [X] I understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• [X] I have followed the Material guidelines for system icons.

Tell us about your contribution.

The MDI has icons train-car-container and train-car-tank, but there are no analogues train-car-container and train-car-tank. They are needed for the development of crm, but may be needed by other companies involved in freight transportation.

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Upload the icon source.

mdi_i.zip

[andrejsharapov]

Connected with https://github.com/Templarian/MaterialDesign/issues/7168 and https://github.com/Templarian/MaterialDesign/issues/7169