Update FastPix links and prerequisites section

[ashutoshkhainar33-star]

FastPix Resumable Uploads SDK - Documentation PR

Documentation Changes

What Changed

• New documentation added
• Existing documentation updated
• Documentation errors fixed
• Code examples updated
• Links and references updated

Files Modified

• README.md
• docs/ files
• USAGE.md
• CONTRIBUTING.md
• Other: _______________

Summary

Brief description of changes:

Code Examples

 val rotation = windowManager.defaultDisplay.rotation
        when (rotation) {
            Surface.ROTATION_90 -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
            Surface.ROTATION_180 -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT
            Surface.ROTATION_270 -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE
            else -> requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
        }

        preset?.let { p ->
            try {
                rtmpCamera.prepareVideo(
                    p.width,
                    p.height,
                    p.frameRate,
                    p.bitrate,
                    4,
                    CameraHelper.getCameraOrientation(this)
                )

                rtmpCamera.prepareAudio(
                    128 * 1024,
                    48000,
                    true
                )

                val streamUrl = "$rtmpEndpoint/${streamKey ?: ""}"
                rtmpCamera.startStream(streamUrl)
                liveDesired = true
                goLiveButton.text = "Connecting... (Cancel)"

                Log.i(TAG, "Stream started")
            } catch (e: Exception) {
                Log.e(TAG, "Failed to start stream: ${e.message}")
                showToast("Failed to start streaming")
            }
        }

Testing

• All code examples tested
• Links verified
• Grammar checked
• Formatting consistent

Review Checklist

• Content is accurate
• Code examples work
• Links are working
• Grammar is correct
• Formatting is consistent

---

Ready for review!