feat: Add Awesome Symbian

[hstsethi]

Firstly thank you for creating this list. It's really helpful and I have linked it in Awesome Symbian as well.

An Awesome List about everything related to Symbian OS. Documentation, academic papers, tutorials, communities, IDEs, SDKs, emulators, apps, video games. Symbian is a discontinued mobile OS for ARM popular in early 2000s. It had two major UIs: S60(Nokia), and UIQ(Sony Ericsson). It supports .jar, .jad, .sis, .sisx formats. The main development environment since S60 is C++/QT, but J2ME, Python, C, Flash Lite, C# are supported as well.

Symbian OS is written in C++ and even had it's own flavor of C++ called Symbian C++. After S60, the development environment was changed to QT/C++. Symbian source tree is also one of the best C++ codebase, IMO.

For all those reasons, I feel like this list should be included.

Thank you