Fixing dependecy conflict, add port argument and allign readme.md

[FunkyOz]

I changed the goggle translations library cause the previous one had conflicts with openai library (see ssut/py-googletrans#400).
The solution explained in this issue does not work so I decide to migrate to pygoogletranslation, at the version 2.0.5 (instead of 2.0.6 cause is broken too). The apis of these libraries are the same so I changed only one line of the code. Now we're able to install requirement directly from requirements.txt without any workaround.
Additionally I make two other changes:

• Add port number to the main command, so we can change it if requires. Default port is 5000.
• Modify the README.md cause was not alligned with the code.