Multiple accounts support

[irudoy]

• .td dir for tdlib files
• separate dir for each account
• input messages with phone number marker
• separate logs
• example

fixes #16

[irudoy]

├── app.js
└── .td
    ├── PHONE_NUMBER_FIRST
    │   ├── _td_database
    │   └── _td_files
    ├── PHONE_NUMBER_SECOND
    │   ├── _td_database
    │   └── _td_files
    └── log
        ├── PHONE_NUMBER_FIRST.log
        └── PHONE_NUMBER_SECOND.log

[nodegin]

Many thanks for the PR!

I am currently working on the multi-account support in my local branch, I will push it very soon. 🙏🏻

[irudoy]

Oh, sounds good! I will wait for it.
It would be nice if you push WIP local branches, so everyone else knew what's going on and could take a part 😉
Also, I think, we need the roadmap for project.