Add Assets, Timeline and Audio uploads

[0xrohitgarg]

Description:

• Concept of Audio Files 🔈
• Concept of MediaAsset : VideoAsset, AudioAsset 💼
• Concept of Timeline for editing workflows ✂️
• Minor updates in readme & package.json

Changes:

🔈 Audio Files :

• Audio class under src/core/audio.ts
• Upload Audio Files using Collection.uploadUrl() or Collection.uploadFile()
• Fetch Audio Files using Collection.getAudios() or Collection.getAudio()
• Delete Audio files using Collection.deleteAudio()

💼 Media Assets:

• MediaAsset, VideoAsset and AudioAsset class under src/core/asset.ts

🎞️ Timeline :

• Timeline class under src/core/timeline.ts
• editing support for Inline asset addition using Timeline.addInline()
• editing support for Overlay asset addition using Timeline.addOverlay()

Testing:

• Audio Files
• Media Assets
• Timeline