Add clarification: LBRY SDK does NOT require blockchain sync

Added FAQ-style notes to both README.md and LINUX_SETUP.md explaining:
- LBRY SDK is a light client, not a full node
- Does NOT download the blockchain
- Only downloads requested content
- Minimal disk space usage

This addresses common concerns about blockchain size and sync time.

LINUX_SETUP.md

@@ -32,15 +32,28 @@ cd LBRY-Downloader
 
 This script will:
 1. Check and install system dependencies
-2. Set up a Python virtual environment
-3. Install Python packages
-4. Ask for your download location
-5. Configure channels to download from
-6. Set download limits
-7. Create launcher scripts
+2. Download and install LBRY SDK (lbrynet) - **No blockchain sync required!**
+3. Set up a Python virtual environment
+4. Install Python packages
+5. Ask for your download location
+6. Configure channels to download from
+7. Set download limits
+8. Create launcher scripts
 
 **Want to uninstall later?** Just run `./uninstall.py`
 
+### About LBRY SDK (lbrynet)
+
+**Q: Does this download the LBRY blockchain?**
+
+**A:** No! The LBRY SDK is a light client that:
+- Connects to LBRY's servers and peer network
+- Downloads only the content you request
+- Does **NOT** require blockchain synchronization (unlike Bitcoin)
+- Uses minimal disk space (just the downloaded content)
+
+The LBRY SDK acts like a specialized download manager for the LBRY network, not a full blockchain node.
+
 ---
 
 ## Manual Installation

README.md

@@ -40,6 +40,7 @@ cd LBRY-Downloader
 
 The setup script will:
 - ✅ Check and install system dependencies
+- ✅ Download and install LBRY SDK (lbrynet) - **No blockchain sync required!**
 - ✅ Set up a Python virtual environment
 - ✅ Install Python packages
 - ✅ Ask for your download location
@@ -47,6 +48,8 @@ The setup script will:
 - ✅ Set download limits
 - ✅ Create launcher scripts
 
+**Note:** The LBRY SDK is a light client - it connects to the network and downloads content **without** needing to sync the entire blockchain (unlike Bitcoin). It only downloads the content you request.
+
 ### Manual Install
 
 See [LINUX_SETUP.md](LINUX_SETUP.md) for detailed manual installation instructions.