Completely overhaul the documentation

readthedocs/developing/tips-for-porting-the-project.rst

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+============================
+Tips for Porting the Project
+============================
+
+
+If you're going to use the code on this repository to guide you, please
+be kind and don't forget to mention it helped you!
+
+You should start by reading the source code on the `first
+release <https://github.com/LonamiWebs/Telethon/releases/tag/v0.1>`__ of
+the project, and start creating a ``MTProtoSender``. Once this is made,
+you should write by hand the code to authenticate on the Telegram's
+server, which are some steps required to get the key required to talk to
+them. Save it somewhere! Then, simply mimic, or reinvent other parts of
+the code, and it will be ready to go within a few days.
+
+Good luck!