Created Exchange in spring
Introduced stockID to Market Interface
Added stock id (implemented changes in Market Interface)
Added Exchange class and implemented placeOrder method.

Issues : Have to add all the methods.
Implemented changes in Market Interface.

Issue: temporary implementation
Created a new Main class and added Exchange reference.
Added stock IDs to spring xml.
Added Human Interface.
Fixed singleton issue
Created Exchange in spring
Introduced stockID to Market Interface
Added stock id (implemented changes in Market Interface)
Added Exchange class and implemented placeOrder method.

Issues : Have to add all the methods.
Implemented changes in Market Interface.

Issue: temporary implementation
Created a new Main class and added Exchange reference.
Added stock IDs to spring xml.
Added Human Interface.
Fixed singleton issue
Merge branch 'v1.2-multiasset-exchange' of https://github.com/investovator/investovator-jasa into v1.2-multiasset-exchange