Ports: Add initial Python 3.6 port

This port is experimental and not all pythom modules are working.
But this is an initial shot which can be further worked on, as
SerenityOS gets more mature. :^)

The main limitation is that locales, threading and time related
functions are not working.

Ports/python-3.6/README.md

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+# Python 3.6 Port
+
+This port is highly experimental. Python binary can be started with `python3`, but many
+functionality is expected to not work.
+
+## Why this version is used
+
+Python 2.7 will not be supported in future, see e.g. [pythonclock.org]([https://link](https://pythonclock.org/)).
+Python 3 is a good candidate for porting. Until Python 3.6 it is easily possible to disable
+multi-threading API via `--without-threads` option. This is needed until SerenityOS provides the
+pthread APIs.
+
+## How to improve
+
+Run the Python test suite via `python3 -m test` to see what fails and start working on that.
+If functionality in LibC/LibM/Kernel/... is updated, recompile Python with `./package.sh build`.
+
+## Known limitations
+
+* No locale support, default locale encoding set to utf-8
+
+* Instead of `/dev/urandom`, `/dev/random` is being used
+
+* No multi-threading
+
+* time module not working due to missing time related functions in LibC/Kernel