This is branch is hometask 3: Junit. Added tests, changed realisation RandomGenerator, added enum Employee.
Added plugin maven-surefire-plugin to pom.xml
Integration JDBC complete
added choice of source saving date
change realisation company class
Added patern Factory
fix random error, refactoring jdbc code
Added singleton to company
Added google guice ijection. Remove singleton from company because sigleton need private constructor, but google guice need public constructor for injection. Fix concole input error.