Verify that we are in a factori project

Some factori command could return kind of unexpected error for the user, some commands like deploy needs to be launched inside of a factori project we could check if we are in a factori project, with files or other things to raise a proper error like "You are not inside of a factori project"

factori deploy --storage random --network flextesa --csharp monster                                                     
[write_file(/home/arnaud/Desktop/second_factori/src/csharp_sdk/Deploy_scenario_monster.cs)] Not a directory: /home/arnaud/Desktop/second_factori/src/csharp_sdk.