sqlite doesn't support enum

[amirmehdi]

I used this jdl to import in a monolithic project.
https://github.com/jhipster/jdl-samples/blob/master/online-shop.jh

two issues occurred:

1. wrong import in the category in category-model and category-entity . that's not important
2. error in npm start occurred:
   Data type "enum" in category is not supported by "sqlite" database.

I solved this issue in development mode by this:
typeorm/typeorm#1414

I use 'simple-enum' in type field for @column

[ghost]

Yes, there is already #74 related issue. You are the best!! Could you contribute with a Pull Request? it should be very nice :)

[ghost]

The import error is due to a recursive relationship:

relationship ManyToOne {
	Category{parent} to Category
}

[ghost]

I have just fixed the recursive import and adding new simple-enum type (merged by PR). Thanks.