* init lesson
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* update
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* update
* update gitignore
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* update
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* update
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* update
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* update
Merge branch 'master' of github.com:OperationSpark/variables-and-constants
* complete lesson