Add a FAQ page

[erbesharat]

Is this a BUG REPORT or FEATURE REQUEST?:
feature

What happened:
We currently don't have any straightforward description of the project for the general users who don't have the required backgrounds to read the documentation.

What you expected to happen:
Add a FAQ page that answers the list of questions that are at the end of this issue.

How to reproduce it (as minimally and precisely as possible):
nil

Anything else we need to know?:
Questions list:

• What is TXTDirect?
• What TXTDirect solves and who needs it?
• What is the difference between TXTDirect and txtd.io?
• How can I request a new feature or report a bug?
• How to use the hosted service aka txtd.io? (Short description and link to guides)
• How to install and setup TXTDirect? (Short description and link to documentation)
• ...

P.S: Please add any questions that you think might be useful to the list.

[stp-ip]

Why is TXTDirect needed? -> controlling your traffic, easy recognition with full control...
What's the difference between bit.ly and TXTDirect? -> centralized service with affiliate injection vs an open protocol with an open source implementation and a hosted service without lock-in...