Ayah-sender

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- Added get_image() method to `AyahSender` class
python
get_image(chapter_num, verse_num, output_dir='.')

- Fetches and saves png image of an ayah
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- Changed output file name for the audio files
**Example filenames:**
- `Abu_Bakr_Ash-Shaatree_128kbps_Surah_An_Nisa(4)_Ayah1.mp3`
- `Abu_Bakr_Ash-Shaatree_128kbps_Surah_An_Nisa(4)_Ayah1-5.mp3`
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- Some minor change of codes

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- Added [examples](https://github.com/codewithasib/ayah-sender/tree/main/examples) to the examples folder
- Changed `fetch_single_ayah` function name to `get_single_ayah`