target: tizenrt-artik05x: add minimal working port and the guide

[glistening]

I would like to introduce a new port tizenrt-artik05x.

Tizen RT is a lightweight RTOS-based platform to support low-end IoT devices. The project is under developing in github tizenrt repo. Artik05x is an IoT SoC solution that will be released soon. Please refer to Artik053 for more information.

I will make a PR that contains the minimum porting that can print Hello world from jerryscript and a document for building and running.

[zherczeg]

+1

[akosthekiss]

@glistening #1775 and #1786 have landed some days ago. Do you have plans to submit PRs related to this issue, or has goal been reached and we can close this topic?

[glistening]

@akosthekiss I will make another PR for tizenrt. I am thinking of checking and getting recent PRs from NuttX port (e.g., setjmp/longjmp, using jerry-libm instead of system libm, and so on). I will follow your suggestion whether I will make it another issue or consider as a part of minimal port.

[akosthekiss]

@glistening it's completely fine to keep this issue open if you still have related plans.

[glistening]

Closed since #1822 and #1825 are landed.