Add a link to new exercise WallStreetDbInitializer

Author: tboychuk

README.md

@@ -12,4 +12,5 @@ It is important to have a different type of activities, which purpose is improvi
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 * [Product DAO](https://github.com/bobocode-projects/jdbc-api-exercises/tree/master/product-dao)
 * [Account db initializer](https://github.com/bobocode-projects/jdbc-api-exercises/tree/master/account-db-initializer)
+* [Wall Street db initializer](https://github.com/bobocode-projects/jdbc-api-exercises/tree/master/wall-street-db-initializer)