Store and retrieve terms and conditions text

[aniri]

The terms and conditions text should be stored in the db as html.

A get endpoint should be used by the frontend apps in order to retrieve it.
Todo:

• rename LocalizationController to AdminLocalizationController
• change route to admin/content
• add method AddOrUpdateContentAsync(AddOrUpdateContentModel model) to add a new row in StringResource table
• Add project called DeUrgenta.Contnent.Api
• Add ContentController
• Add a method GetContentAsync(string key) see for refference LocalizationController.GetString
• Add a method GetAvailableContentKeys() which will return all available keys fo language from Accept-Language header
• Add a method GetAvailableLanguages() which will return all available languages

[DSVDavid]

Can I take this one?

[idormenco]

@DSVDavid all yours! I have updated todo list