add advanced search

[4drianMatei]

under the search bar instead of the language add an extension panel with advanced search (language) - or as in gmail search options https://material.angular.io/components/expansion/overview

filter categories:

• language
• level (beginner/intermediate/advanced) // first it needs to be introduced in GUI
• has source code
• publication date....

order/search by:

• newest
• stars
• relevance

consider adding a text index to mongo https://docs.mongodb.com/v3.2/core/index-text/

[4drianMatei]

text search in mongodb https://docs.mongodb.com/manual/text-search/