Add Symbian

[hstsethi]

https://github.com/hstsethi/awesome-symbian#readme

[Explain what this list is about and why it should be included here]

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.

It should be included as it's the most updated and comprehensive list on Symbian OS.

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[hstsethi]

unicorn

[hstsethi]

@sindresorhus Can you please review it.

[Tryboy869]

Thanks for contributing! The list looks comprehensive. A few issues to address per the guidelines:

PR Description Issues:

1. Description format: The description should be shorter and more objective. Current description is too technical/historical.

   Suggested: "Discontinued mobile operating system for ARM processors."

2. Missing "unicorn": To verify you've read all guidelines, you must include the word "unicorn" somewhere in your PR description.

README Issues:

3. Title format: The README title should be title case format:

   • Current: (need to check exact title)
   • Should be: # Awesome Symbian

4. Missing Awesome badge: The README should include the Awesome badge at the top:

   [![Awesome](https://awesome.re/badge.svg)](https://awesome.re)

Table of Contents: The TOC is embedded in the description paragraph. It should be a separate section named "## Contents" (not "Table of Contents") and should be the first section after the description.
Self-promotion: Remove "Please give it a star(⭐) to support the development" - this goes against the objective nature required for awesome lists.
Links without #readme: Many GitHub links don't end with #readme. All GitHub repo links should follow this format:

• Name - Description.
  Please fix these issues and update your PR. See the full guidelines: https://github.com/sindresorhus/awesome/blob/main/pull_request_template.md